Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8974f306d3b6457…

MALICIOUS

PDF

46.8 KB Created: 2020-08-24 21:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d92e518455fc92c9cafbafd3cb7b7548 SHA-1: 21a33f95b17b6ccc7a4a0714af1d2cbaa8402996 SHA-256: e8974f306d3b64576a68897d1b34711d8ecdcb162667cf8fe518b48cc9cebf92
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cells+at+work+anime+parents+guide, which is likely used to redirect users to a malicious site.

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/pify?keyword=cells+at+work+anime+parents+guide
    • http://migem.forstinn.com/uploads/1/3/1/6/131606505/besanidugeluzas_potis_wujeroda_rudikowasewenox.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/lalederarutexedomovigi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7224/8215/files/diet_plan_to_lose_belly_fat.pdf
    • https://cdn.shopify.com/s/files/1/0434/1556/8546/files/36687944222.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/xojabumuxopelol.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/mekawexubevemijimapoled.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/danejegurodaduk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3019/files/85463632144.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/54158295126.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/61871886251.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_off00007965.bin
d1ab7f59c5f626592eb00544020a9acfbdace2d4d6aafd0b9a6554c968d12997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 5340 bytes
font_01_sfnt_off00008b87.bin
f6a1cbbb714bc6b8c1d97d40f645afd92290ed158cbb7a14e3274a00551c71da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B87 10300 bytes

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