Malicious PDF — malware analysis report

Static analysis result for SHA-256 7855c76bd7d2af3f…

MALICIOUS

PDF

35.8 KB Created: 2020-08-19 18:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cfc9103c2d5b2fa06077e346612034d SHA-1: 4e7d7d7d239ed0e35d94cff988e151165d5edb7d SHA-256: 7855c76bd7d2af3f5b5a34f35afefea21c12d91242a2d660000b901da4ae4af9
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to lure users to malicious content. The embedded document body text, though partially corrupted, mentions 'Photolayers superimpose eraser apk' and includes the malicious redirector URL, suggesting a phishing or malware distribution lure. The ML classifier strongly flagged this PDF as malicious.

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=photolayers+superimpose+eraser+apk
    • http://files.rationalhedonism.org/uploads/1/3/0/7/130776131/9912560.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/pawawixumenibafixasanop.pdf
    • https://cdn.shopify.com/s/files/1/0437/6307/3181/files/70820054828.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/exemple_attestation_stage.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/alien_shooter_hack_version.pdf
    • https://cdn.shopify.com/s/files/1/0429/5350/6969/files/13673935444.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/bark_at_the_moon_solo_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/fotibofaxekulugifo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3576/9497/files/93731960079.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_off00004485.bin
d248e050604671b7964d57238f833165aa9af1a201d6e4c68c2b32c7cb79a17f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4485 2952 bytes
font_01_sfnt_off00004f0f.bin
4b0f6eec3e15d3087eede8017426118ce31cb4d3d70cc10261f963599f226462
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0F 5224 bytes
font_02_sfnt_off000060b6.bin
102b2445b71a587c96183cad394e4d7d665e5e4152cca3e78198a26a8cfb85ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B6 9856 bytes