Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0eccaf34ce3995…

MALICIOUS

PDF

37.7 KB Created: 2020-09-05 01:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7681666e5ff4ff0bb68b242f434ca83 SHA-1: fab9cb03736536e7d0ac60bbf2c4d9b8a1741ecd SHA-256: 5c0eccaf34ce3995bb9577b0aba163f3832bf8db30ecae3b92e41b6e62cfee5b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, disguised as a quiz answer, points to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body and embedded links suggest a phishing or scam attempt to drive traffic to malicious sites.

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.link/wix?keyword=logo+quiz+level+15+answers+iphone
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ceb2e8_5721562aaee742c884ce6438aa7f2766.pdf
    • https://static.usrfiles.com/ugd/1da05d_0fa58c48ac70425e8bc57baeda97594a.pdf
    • https://static.usrfiles.com/ugd/01e791_cf01df280e3d4362b874a3b156da9582.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/vadexamireg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/mapa_antigua_guatemala.pdf
    • https://cdn.shopify.com/s/files/1/0436/9901/1738/files/bachelor_party_movie_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/worawumijemuzer.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/bell_s_palsy_exercises_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/18813322245.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0358/files/26304396427.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/2743477687.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/bunipozabazo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9490/7810/files/juzurupika.pdf
    • https://static.usrfiles.com/ugd/3615fb_8307b0e31dd84dfa87c9ee993bed6870.pdf
    • https://static.usrfiles.com/ugd/90c678_0cba58505dfd49a9825626bd5ab28cd4.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_off00005450.bin
9ec1b60e677744249b44ea531769b925a736bef5735a2602decc2249d9ff3362
pdf-font-stream PDF embedded font (sfnt) at offset 0x5450 5524 bytes
font_01_sfnt_off0000673b.bin
c89ba2c1367e75d589e8702e0962619e7d6ab39837adea663bb81d23e0329549
pdf-font-stream PDF embedded font (sfnt) at offset 0x673B 10260 bytes