Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f60c5747cc87b84…

MALICIOUS

PDF

38.0 KB Created: 2020-07-23 13:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e166ed223ab0d36e4ed644f629031302 SHA-1: 1e61c88712cdf3cce540f334087a5742459ae71b SHA-256: 9f60c5747cc87b8447923cf94a09b9938d6ed5b85b143bdcd2b76b84f541e6e6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for 'Human physiology by ak jain pdf download'. This suggests a phishing or social engineering attack aimed at directing users to malicious content. The PDF also hosts a large number of links to other PDFs on Shopify domains, potentially as a SEO spam or link farm tactic to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=human%20physiology%20by%20ak%20jain%20pdf%20download
    • http://files.fcagdept.com/uploads/1/3/1/6/131606486/2542363.pdf
    • http://files.1stpocoscoutinggroup.com/uploads/1/3/0/8/130813514/d3b424db.pdf
    • http://files.fortclarkdays.org/uploads/1/3/1/4/131411539/lojefinukorivesosim.pdf
    • http://files.rubyscardsandgames.com/uploads/1/3/0/7/130776640/9809410.pdf
    • http://files.brittmaplesyrup.com/uploads/1/3/1/3/131383953/zodevanusopeb-vadikigumare.pdf
    • http://files.fortclarkdays.org/uploads/1/3/1/4/13141153
    • https://cdn.shopify.com/s/files/1/0431/9779/2420/files/marizutovetotogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/mojumot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/46812603049.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewobaropelizovijekozuji.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/73417455609.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8997/files/54093971485.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/gixamosigi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/53055305764.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/wobipupejewozefabupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/7148541979.pdf
    • https://cdn.shopify.com/s/files/1/0440/7069/9160/files/xixirok.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/68369271275.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4744/files/90465881779.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/65472001888.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_off000055cc.bin
54749d518676e2993168df6159b297fa2fc4083b07f4f9063a66651d3a777f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55CC 5476 bytes
font_01_sfnt_off00006847.bin
16d8cf49b94996094dc354a8a67310e2c7c18e2cb31a62d35d762585cbcbdc67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6847 10112 bytes

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