Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d90c0208bf09f10…

MALICIOUS

PDF

44.7 KB Created: 2020-08-13 04:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b1c06f17ff70d51fff827309da5ab15 SHA-1: 0cf51a18cdec3562a083996e818c1d4ea60f7aec SHA-256: 9d90c0208bf09f1089cf2da40970c5e7fcdef2f4c63bb3bfda8518b906197e25
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm designed to redirect to malicious content. The primary redirector URL is ttraff.ru, which is flagged as malicious. The document body itself is heavily obfuscated but contains references to the malicious URL and numerous benign-looking Shopify URLs, likely part of the link farm. No scripts were extracted, but the PDF structure and link farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=applied%20physics%20pdf%20btech
    • http://files.larryssportsexchange.com/uploads/1/3/0/8/130874128/folerezome.pdf
    • http://files.meldongardens.com/uploads/1/3/1/4/131437147/zijivetovebo_zugonipezeronik_fofipuj.pdf
    • http://files.dievaityte.com/uploads/1/3/0/7/130776205/gudeg_taxomiwusaxure.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/taruluvuporegosewalis.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/berliner_platz_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/migemigizugalerovexad.pdf
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/xumelegitonu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9743/0941/files/78107581057.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/tarinidovorevoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/55870589617.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/zapopewoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/minecraft_wood_house.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/laniwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/21108184830.pdf
    • https://cdn.shopify.com/s/files/1/0437/9957/6733/files/bakery_equipment_list_business_plan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059ec.bin
82810e2ae8a4c7f6d3d0fd1064300b175a05c7d2158a5730545c35485f692bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59EC 6616 bytes
font_01_sfnt_off00007050.bin
8d44dd63c36b767046a0987311a8c8191fb2f4a093a9f9261e256d44a5f13ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7050 5168 bytes
font_02_sfnt_off000081e3.bin
a6cd84728e0ac4b348d6aaaf2fb04cbc92b752a7be8154f9909c5eac5175f577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E3 10564 bytes

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