Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b18f9b0971b9a46…

MALICIOUS

PDF

39.2 KB Created: 2020-08-20 19:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17debc9927a9f4c54d7c269f02d32f03 SHA-1: 1fac1906cdadb0c76616259b570c695befc4995d SHA-256: 0b18f9b0971b9a464ae3fb91790ffe0b84559b32dd8cba53fc5021825e5ffb38
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.com/pify?keyword=challenging+math+worksheets+for+6th+graders', leads to a known malicious redirector. The document body, though heavily corrupted, contains references to 'challenging math worksheets for 6th graders', indicating a lure to encourage link clicks.

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.com/pify?keyword=challenging+math+worksheets+for+6th+graders
    • http://files.candycoatedcreations.com/uploads/1/3/2/6/132695325/zolixasegegus-xavesomume-dibotenujimev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/82223793973.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/xazevutafizidefejore.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/ned_for_speed_most_wanted_crack.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/89625013396.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/fipetapebotegulib.pdf
    • https://cdn.shopify.com/s/files/1/0432/9321/2827/files/callan_method_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0432/7181/5331/files/36287124178.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/vupiboto.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/71469793809.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/85157757749.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0491/files/tokogoliledotubanunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7364/2389/files/bakteri_agrobacterium_tumefaciens.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_off00005b06.bin
4ee97d6532913dd920cb1d2e98910c94aa65e2bd53b334178dc8c40070387c1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B06 5536 bytes
font_01_sfnt_off00006db9.bin
c5197f118191dba747bc67de565d83c1c3150a1cf09314ad26a7f78247bbe044
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB9 10044 bytes