Malicious PDF — malware analysis report

Static analysis result for SHA-256 05af4402b4edde83…

MALICIOUS

PDF

69.0 KB Created: 2020-08-26 08:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5fb6d7b763ad903051329bbf6a9c4ce SHA-1: 5092d6f12de92fd258ff2826c65dcf899611a033 SHA-256: 05af4402b4edde83e1b0c2fcbde13b1125ab22f2bc07d6925508c48f305d1d06
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are algorithmically generated and point to a redirector infrastructure. The primary link, disguised as a density measurement, leads to 'https://ttraff.com/pify?keyword=density+of+wood+g%252F+cm3', a known malicious redirector. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=density+of+wood+g%252F+cm3
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • http://lemivisul.trinitydentalcentre.ca/uploads/1/3/2/8/132814930/fisov-pasodomovuj-wefizuja-xisit.pdf
    • http://zuvaxe.winzerfarmcda.com/uploads/1/3/0/8/130813669/nivaleteti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/wobeniwotusorurovere.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/93838800416.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/45269779823.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/the_slave_girl_buchi_emecheta.pdf
    • https://cdn.shopify.com/s/files/1/0428/1237/5207/files/midufemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/52235433609.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/what_about_now_daughtry_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/zikezuvonezazaxegupepenu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/annex_11_air_traffic_services.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/broodmother_dota_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/6339/2921/files/39333577447.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/alleppey_tourist_guide.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_off0000b5f5.bin
2cc70e0bb7472f8efad63bf085b454945f3b1f3e05d52018232a7bee3dea8666		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 5184 bytes
font_01_sfnt_off0000c7b3.bin
f34044d5aee4d1ce13defcbc927b26611c27016ddb77234732695a79a2403a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 15480 bytes
font_02_sfnt_off0000f707.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 4324 bytes

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