Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0c5a3efe4e0045…

MALICIOUS

PDF

140.2 KB Created: 2020-08-06 06:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f961408b6dfff51b4c10916dd5fe3e20 SHA-1: 40b4807ea87250deca21528d247333d58831a679 SHA-256: ac0c5a3efe4e0045b8afdea788276f1c004f850d473952ac2efa27ae084e581f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=encyclopedia+of+world+history+in+urdu+pdf'. This URL is designed to lure users into clicking, likely for phishing or malware distribution. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=encyclopedia+of+world+history+in+urdu+pdf
    • http://files.federicabruni.com/uploads/1/3/2/8/132813998/b31b8dcb099ae.pdf
    • http://files.thelandscapestore.net/uploads/1/3/1/4/131453284/21113ca368574c.pdf
    • http://bobig.thekansasbeecompany.com/uploads/1/3/0/7/130776031/vabetapimozira.pdf
    • http://files.womenandmath.org/uploads/1/3/0/9/130969373/pidaga_xavuxokafub_razapumax_vafejesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/56700871984.pdf
    • https://cdn.shopify.com/s/files/1/0434/0252/6872/files/defensa_nacional_peru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/94860752422.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/reberev.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/88102818952.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/kodaxarebolow.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8266/files/rejezoduzumig.pdf
    • https://cdn.shopify.com/s/files/1/0438/7966/1736/files/pdf_to_wordpad.pdf
    • https://cdn.shopify.com/s/files/1/0437/1546/1275/files/98062965149.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/48258535508.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/86845574708.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001d525.bin
777f952f5c4f33096925a78269f1942772a590e842fb929c028696b170b3bf9e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D525 27996 bytes
font_00_sfnt_off00018283.bin
e5c42ee074e7609fb0e0e6f6f38165c601ca26cdb95514039c8b019535b0faaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18283 5276 bytes
font_01_sfnt_off0001943e.bin
365e25c01a015ff1651599d5d09b35ad12583b9a1c2c95403d401053e0723cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1943E 6436 bytes
font_02_sfnt_off0001a3e1.bin
54342b5e6f7bd77a912eead55cc213090ea54415de92345db057059ec5d5cf65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E1 16820 bytes
font_04_sfnt_off0002067f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2067F 4324 bytes
font_05_sfnt_off0002147f.bin
991671226e886ae984557c14798c06b31dca65a22835cf7ad89f51d2da2ae584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2147F 3420 bytes

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