Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e139a0becfa24a…

MALICIOUS

PDF

53.4 KB Created: 2020-08-31 08:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64c627f909eb375fb456102cff6cfbbf SHA-1: 39941eda5a6e33018516f9c48048a3b7ebe647e5 SHA-256: 83e139a0becfa24a2221338a1a193c70459358707ac47a9c1c9378df80d4839c
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 external PDF files, suggesting a link farm designed to manipulate search engine results or lure users to malicious content. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'Animal Farm'.

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/wix?keyword=animal+farm+chapter+5+vocab
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2493/3283/files/comment_attirer_l_argent_avec_le_basilic.pdf
    • https://cdn.shopify.com/s/files/1/0439/0889/0792/files/watch_my_hero_academia_two_heroes_en.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/12866400637.pdf
    • https://cdn.shopify.com/s/files/1/0437/0890/7688/files/gofuwuzefuk.pdf
    • https://static.usrfiles.com/ugd/7dd30d_c53c076d509d4f8f9189c64512fca725.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ab8d2e2da394f6191214d53b1402e32.pdf
    • https://static.usrfiles.com/ugd/97634b_d1f45168a58642a6837523978047c3c2.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/38983296950.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/gowabigodegexa.pdf
    • https://cdn.shopify.com/s/files/1/0452/5981/7122/files/all_of_me_john_legend_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/mister_bechara_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/litoweve.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/giratoxugiliwelija.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/customer_journey_template_pptx.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_off00009347.bin
cad4348ecc9507e2a18c89e41ad361a541b268c5a14a2ccbf0eda2df4525737b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9347 5388 bytes
font_01_sfnt_off0000a56e.bin
b3c7c80124b0f27dc9af16304e6abb25ab9489d12866ac98a62b6739f622f346
pdf-font-stream PDF embedded font (sfnt) at offset 0xA56E 10240 bytes