Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8b226546c858f2…

MALICIOUS

PDF

43.5 KB Created: 2020-08-17 08:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce21b9a469223edc868074bcbb0f2be1 SHA-1: 8bb6f99c6e844538b866e780159338bde26f8798 SHA-256: 6f8b226546c858f2c53111b860a0f33e579d16b2a01f04d4f10f4ffb73579a4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=fitted+sheet+mattress+depth', which is likely used to redirect users to a malicious site. The presence of many Shopify links suggests an attempt to blend in with legitimate content while masking the malicious intent.

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=fitted+sheet+mattress+depth
    • http://files.hhupholstery.com/uploads/1/3/2/7/132740234/0ee45af8e15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/lomewukagabuvopanapok.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/39561810667.pdf
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/pay_my_metro_pcs_bill.pdf
    • https://cdn.shopify.com/s/files/1/0433/4675/5734/files/jowefosabumisop.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7046/files/tet_paper_1_answer_key_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/87637094180.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/28535635381.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/pdf_to_word_document_converter_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/4222/6854/files/matetesunujuxapinade.pdf
    • https://cdn.shopify.com/s/files/1/0434/2484/1890/files/2139903639.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/eicr_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/ramazafawisifotugevomug.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/80788161267.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca8.bin
8be5259b0541b8e752cd11c2f9c27763181f84131663449f19efedcf7c72cd3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA8 5120 bytes
font_01_sfnt_off00007dec.bin
d73383726289f57cf4304dae1aa4db22fe119062a8a28e01a6312035dd3f9e18
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEC 10356 bytes