Malicious PDF — malware analysis report

Static analysis result for SHA-256 7045a1f01e9a27fe…

MALICIOUS

PDF

36.7 KB Created: 2020-08-25 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6620ba01e25995279a324c97bc272dfc SHA-1: e86b5f3f04f983f4dd4121818e52ee467f7d133e SHA-256: 7045a1f01e9a27fe010e0ce53417f8be420ad00dd00c2ecdb683d1adb21e6bcd
154 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a guide. The ML classifier also strongly indicated maliciousness. The presence of numerous external links suggests a link farm or SEO spamming technique.

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=osrs+kalphite+cannon+guide
    • http://wovifopab.cavespringhsband.com/uploads/1/3/2/7/132740214/dukow_girod_kelakexad_birumafaboxivit.pdf
    • http://files.pamperedbyeartha.org/uploads/1/3/2/6/132683357/rivejapixex-jopulipexaj-bamusewuz.pdf
    • http://wewunopuv.monarchglassstudio.com/uploads/1/3/1/6/131607600/3889329.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/8927/8616/files/brennan_manning_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/5164/5093/files/futotujejefo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/6336642464.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/61352753281.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/mikolavamudugeragizogeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/lojise.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/33148688117.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/beginners_guide_to_landscape_photography.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/gatufupofogejorunuledexub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000436d.bin
cb4dbde4bfb55876ce46f021b91995af6a82e3902530b6b8240a3467d874a724
pdf-font-stream PDF embedded font (sfnt) at offset 0x436D 5308 bytes
font_01_sfnt_off0000556a.bin
a4dcb3269e2dbab9491902ebb57a696c47225c4cebdb6db34f785d5425643f6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x556A 10164 bytes
font_02_sfnt_off000077fe.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x77FE 4324 bytes