Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f8da6f6b04af40…

MALICIOUS

PDF

32.3 KB Created: 2020-08-20 09:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40ab37315497a896e27118e15289b189 SHA-1: 5ffe47f4a65ba251264186759f8c1d8513af1592 SHA-256: 71f8da6f6b04af40b78de628915575e385c0d7b33860de4026d4daeef84f0ccc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of numerous external PDF files, with one link pointing to a known malicious redirector. This suggests an attempt to lure users to malicious content, likely for phishing or malware distribution. The ML classifier also strongly indicated 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/pify?keyword=kanherichi+phule+breathless+song+free
    • http://sodepabob.seaepiscopal.org/uploads/1/3/0/7/130775934/fefilupozavelujobone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4241/4492/files/illegal_characters_in_filename.pdf
    • https://cdn.shopify.com/s/files/1/0436/9471/9131/files/17821641667.pdf
    • https://cdn.shopify.com/s/files/1/0438/8493/7384/files/bejesosisovafeze.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9374/files/nekubofowotagamiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/lelifubasitusaturutesuweb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6141/9927/files/dan_abnett_the_warmaster.pdf
    • https://cdn.shopify.com/s/files/1/0433/8329/2060/files/wukobamitatinovubuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9833/files/22437413749.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/zufarurubote.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/55841278648.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/vajumexarofezoguzazupu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/fundamental_accounting_principles_23rd_edition_free.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_off000041d6.bin
d990a327eae8196d2db8912dc6a1cf3d5ba7eb992d36f24ab161275a9da372b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x41D6 5388 bytes
font_01_sfnt_off00005417.bin
bc117e5b879718c081d2dc594bfeb9fb5dd0d7c43bfa24fab66a125aecc7458f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5417 9508 bytes