Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69db8af85ad2a9a…

MALICIOUS

PDF

43.9 KB Created: 2020-08-20 02:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c364156d4e7ac9d09a4718907efab0 SHA-1: 92c6d535993c2e874a27e5f922dd6f3544d10cca SHA-256: f69db8af85ad2a9aaa8516f36de2ebdc41dfff51766d6188378be80ab88725e5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs. The primary malicious URL is https://ttraff.cc/pify?keyword=ceiling+fan+downrod+length+guide, which is likely used to redirect the user to a malicious site. No scripts were extracted from this sample.

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.cc/pify?keyword=ceiling+fan+downrod+length+guide
    • http://files.doylecostumedesign.com/uploads/1/3/1/0/131069789/viralafodosam.pdf
    • http://files.soapandstone.co.uk/uploads/1/3/0/7/130776167/savigix.pdf
    • http://musat.loveyah.net/uploads/1/3/2/7/132741555/jepoguvegunije-rewuzu-mubagifodidu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/maxezof.pdf
    • https://cdn.shopify.com/s/files/1/0439/2534/0328/files/73502088737.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/burger_king_coupons_dezember_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/9463/7734/files/cs6659_artificial_intelligence_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/81075763780.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/xuvometopojuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/88948699732.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/98204411980.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/89097645653.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/82680526397.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8742/files/curriculum_vitae_formato_para_llenar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4440/files/60739561407.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f9f.bin
e1d76d24e804dffeadd2fe923f71dd62bfd1a16f3a7790cf0dee4e9bee69f190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9F 4988 bytes
font_01_sfnt_off0000709d.bin
f45cdcb7972fc38f1c0280db1bca4ba9000a972c3d07d68cf12de323c22270cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709D 10536 bytes
font_02_sfnt_off0000949d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x949D 4324 bytes

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