Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec163a2effaf46e0…

MALICIOUS

PDF

49.0 KB Created: 2020-08-13 03:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 115a3f3c399ee2499c1dcdb36af06b4e SHA-1: ef4b35aa78adb96e32996a094823ede34e3648fa SHA-256: ec163a2effaf46e09d3a54a4de05827df4dbd80aeea2f29591d36781703e5017
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector (ttraff.ru), disguised as a free download for educational materials. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Magna carta for public school teachers pdf free download' and the malicious URL, reinforcing the lure.

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=magna%20carta%20for%20public%20school%20teachers%20pdf%20free%20download
    • http://files.fieldtripfever.com/uploads/1/3/1/6/131606782/5514551.pdf
    • http://files.marksart.net/uploads/1/3/1/4/131453598/2139240.pdf
    • http://files.pkpressurekleeninc.com/uploads/1/3/1/4/131455475/283639.pdf
    • http://vozeterop.laineyeverly.com/uploads/1/3/1/4/131406947/7e8b82fc9bf.pdf
    • http://files.docksidedigital.com/uploads/1/3/1/3/131382239/705757.pdf
    • https://cdn.shopify.com/s/files/1/0431/9218/9089/files/89935433830.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/what_does_crack_look_like.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/tinegonamimunuzi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/57384883276.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/18819402801.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/pabezomemufevupefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/87401791532.pdf
    • https://cdn.shopify.com/s/files/1/0436/1427/3693/files/budget_2020_highlights_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4442/2310/files/83091378541.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/dupabawabiradorifita.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008124.bin
bb7cd24822aa8d6ed46059105242d600e9e61d506b37994f2e4e95ae5729f0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8124 5656 bytes
font_01_sfnt_off00009461.bin
95af82961638929f67465476ef1cc5ddcc6f968c694e411fee558f2061cb1c61
pdf-font-stream PDF embedded font (sfnt) at offset 0x9461 10096 bytes