Malicious PDF — malware analysis report

Static analysis result for SHA-256 541de0b65b6317cd…

MALICIOUS

PDF

44.6 KB Created: 2020-08-24 20:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c955b0054e09307621bfbf55faa2d9 SHA-1: d8af033b0c3a8deb5a3b403490b1872e781345a4 SHA-256: 541de0b65b6317cdb458a3a68bb85df049c82fe1f16f6dd486d3b575e3e3ff18
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to benign content on Shopify, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=wileyplus+calculus+1+answers', which is flagged as malicious. This suggests the document is designed to trick users into clicking the link, likely leading to further malicious content or exploitation.

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/pify?keyword=wileyplus+calculus+1+answers
    • http://gekum.thebaptistlighthouse.org/uploads/1/3/1/1/131164312/wobopijaperezu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0151/files/dear_god_lyrics_avenged_sevenfold.pdf
    • https://cdn.shopify.com/s/files/1/0435/6522/0003/files/preliminary_report_jmm.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/camp_rock_movie_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/5081/8969/files/68948803187.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/aruba_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/12171903139.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/how_to_speak_any_language_fluently.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4031/files/41939879650.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/technical_mathematics_with_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9685/files/a_v_g_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1443/files/16416941373.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gubiwunezekubukezo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/70869794349.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/tinubezugopurumalejadus.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ef1.bin
c425baee587a0df3d3a2f8e94a3c0d2669346bb18a0b82a2ed51ffe6f49ca9d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF1 5184 bytes
font_01_sfnt_off000080c1.bin
f59082a5fefaab072dce717834aa37d8a7929d8288d0d2d4d8b33c7df893689c
pdf-font-stream PDF embedded font (sfnt) at offset 0x80C1 10936 bytes