Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55596a32d6376d1…

MALICIOUS

PDF

35.8 KB Created: 2020-08-23 08:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3938715ad094e6b4f56158127afa9671 SHA-1: 1e30429676f20ce88893a1a9981145f6e6beff47 SHA-256: a55596a32d6376d1fc3bf1b8fc1182163fabd431138d234d4d63a6564308ada6
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which are part of a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=da%25C4%259Farc%25C4%25B1k+arap%25C3%25A7a+t%25C3%25BCrk%25C3%25A7e+s%25C3%25B6zl%25C3%25BCk+pdf, which is a known malicious redirector. The document's content, though partially garbled, appears to be related to a Turkish dictionary, likely a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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=da%25C4%259Farc%25C4%25B1k+arap%25C3%25A7a+t%25C3%25BCrk%25C3%25A7e+s%25C3%25B6zl%25C3%25BCk+pdf
    • http://xefopu.charlenemosley.com/uploads/1/3/1/4/131438044/naxililer_remepavukuvate_jimigojovuke.pdf
    • http://files.bvcpsedtech.net/uploads/1/3/1/6/131607662/vetovaked-ketamaneta-salosuriner-sofaluj.pdf
    • http://zobuweve.behngiepseng.com/uploads/1/3/1/3/131379578/texuwibubapoxabus.pdf
    • https://cdn.shopify.com/s/files/1/0437/4849/1425/files/blogging_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0440/6870/0310/files/bipartite_agreement_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/7996/6628/files/48459116412.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/94211086645.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2823/files/24172732032.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/49683865352.pdf
    • https://cdn.shopify.com/s/files/1/0437/9413/7249/files/sniper_strike_blood_killer_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0440/7879/2869/files/kokepubobexuwak.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/2090627121.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/bcs_exam_all_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/8974/6337/files/ejercicios_numeros_primos_y_compuestos_5o_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/fugezagixujilisunixezorig.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_off00004855.bin
92727c7259a65e1a5f0aa85d1916f58179eda42083776a94152d2900bd225a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4855 5964 bytes
font_01_sfnt_off00005c07.bin
3218e516b04755366b41278a140111c1f36ba3ee24b090c61ef24423d2db539e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C07 11748 bytes

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