Malicious PDF — malware analysis report

Static analysis result for SHA-256 230e2c03a47ab5fb…

MALICIOUS

PDF

45.2 KB Created: 2020-07-17 03:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 88a16c3978a890bd7f7bd7be4af709ff SHA-1: b55471d725f5a46f2e855ceabf6a30ad8489c3c0 SHA-256: 230e2c03a47ab5fbefffb125310f2e75ab5f101721735fa6522649b5e4d10217
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to a known malicious redirector at 'ttraff.ru'. Another heuristic indicates a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, contains text related to 'financial markets and institutions pdf download', reinforcing the lure. The primary attack vector appears to be social engineering via deceptive links within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=financial%20markets%20and%20institutions%204th%20edition%20pdf%20download In PDF document text
    • http://files.kanecontractinginc.com/uploads/1/3/1/8/131858108/eb989796.pdfIn PDF document text
    • http://files.thetidewaterschool.org/uploads/1/3/0/8/130874658/basowepilave.pdfIn PDF document text
    • http://files.smartlocal506.com/uploads/1/3/1/3/131398141/b90f59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/dagosigojipefemekoxovugo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/84043220764.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/pukemerapolukotiverelak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/witubibupuxad.pdfIn PDF document text
    • https://dozezup.files.wordpress.com/2020/06/92680419901.pdfIn PDF document text
    • https://wanuparuvev.files.wordpress.com/2020/07/96936785820.pdfIn PDF document text
    • https://gavomibew482746657.files.wordpress.com/2020/07/52295324896.pdfIn PDF document text
    • https://xawuwoliv.files.wordpress.com/2020/07/tilaniwesawosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/fokuvukebufikuxama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1868/1496/files/rugebokevupepajelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/31049462495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/mokifaragepuzegepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/48261287471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/48874837725.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/bukisubodedim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/3006125149.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7164 5476 bytes
SHA-256: 983d79eab413c462d52ee94c56b003ed4366cc6579c037e1754b026ee3b5be68
font_01_sfnt_off000083e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E2 10372 bytes
SHA-256: d15d10cc5b879e39a2db1e5c3f11228579cd99a514aa010013f06336837436ee