Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1033aae6b62df48…

MALICIOUS

PDF

40.4 KB Created: 2020-08-30 11:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 221ec53ef2e9b6eb3ec661e17621d13b SHA-1: 9638b43af0734abcff54080f79e61240710a2fb7 SHA-256: d1033aae6b62df48b025be275b82affc552b1541a70ca4a76e7b1a4f4287c5a7
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=responsive+html+css+website+template, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this malicious URL and other Shopify links, suggesting a lure to external content. The ML classifier strongly indicates maliciousness.

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/wix?keyword=responsive+html+css+website+template
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/9479579058.pdf
    • https://cdn.shopify.com/s/files/1/0428/3616/4774/files/chomp_chomp_fragments_exercise_5_answers.pdf
    • https://cdn.shopify.com/s/files/1/0463/4473/2833/files/54073454275.pdf
    • https://cdn.shopify.com/s/files/1/0456/4162/9863/files/54704633134.pdf
    • https://cdn.shopify.com/s/files/1/0432/5841/3216/files/list_of_all_continents_and_their_countries.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/44995913442.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/masefesixul.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/totujevusalewimugemavuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/1053215055.pdf
    • https://cdn.shopify.com/s/files/1/0462/6389/4173/files/75622359591.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7935/files/zobuzof.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/hermes_scarf_tying_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/50790352337.pdf
    • https://cdn.shopify.com/s/files/1/0437/9138/4736/files/50783898308.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_off0000600a.bin
4e035f9ca9c4ae63f30ba6309c178688c8726aaa815939d675ccdcfee70a18de
pdf-font-stream PDF embedded font (sfnt) at offset 0x600A 5376 bytes
font_01_sfnt_off00007243.bin
bc83f950987617001725846a02ec54fec92c6070d027f33f488071735f575aae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7243 10024 bytes