Malicious PDF — malware analysis report

Static analysis result for SHA-256 7133f8aec42ca942…

MALICIOUS

PDF

43.0 KB Created: 2020-08-23 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34144183eda2422337215d3518101cd3 SHA-1: 7c2634abb7e507c4d8e9dda9a6a477e73869dea7 SHA-256: 7133f8aec42ca9426d46863703d4aaee5ce64abf7106e23c1e2bf8b8d9c02c32
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, which is flagged as malicious. The document also hosts a large number of links to other PDFs, suggesting a link farm designed to manipulate search engine results. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or redirection attempt.

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=partes+de+la+celula+bacteriana+pdf
    • http://binad.leratolefafa.com/uploads/1/3/2/6/132696323/fb8fab5bea32e5.pdf
    • http://pizoxujir.dumassevents.com/uploads/1/3/2/6/132683169/zoguf.pdf
    • http://files.ryesnextchapter.com/uploads/1/3/0/7/130776264/pufinaluloze.pdf
    • http://files.iowamavericks.com/uploads/1/3/1/0/131069992/521b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0466/7742/6341/files/guweniginifudazup.pdf
    • https://cdn.shopify.com/s/files/1/0428/1729/0407/files/install_mtg_arena.pdf
    • https://cdn.shopify.com/s/files/1/0435/5053/9940/files/define_noblesse_oblige.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6778/files/maine_highway_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/bedutera.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/79392998010.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/albiceps_tarantula_care_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/lawolilokofepimanel.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/29546608496.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/kixovopadel.pdf
    • https://cdn.shopify.com/s/files/1/0438/3100/1250/files/aurelio_mejia_mesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/49961658069.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/mitudifipapavefixonarogum.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_off0000691d.bin
497999c7d83f9fe40642260e5b0fde1251516180f9c3e3651d718980b58bc750
pdf-font-stream PDF embedded font (sfnt) at offset 0x691D 5288 bytes
font_01_sfnt_off00007b15.bin
affe90265590522d37976eb6b32d9f0863b941960ccaba772be4eca47a7a387b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B15 10560 bytes