Malicious PDF — malware analysis report

Static analysis result for SHA-256 77de7ba119858aa9…

MALICIOUS

PDF

51.8 KB Created: 2020-09-07 20:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b289015b51a59e2620fbddda43f301 SHA-1: 1e233bcb5ec300882f93a0b5373d7488aa45b655 SHA-256: 77de7ba119858aa9bbb804d726bfc401e1bb6206b446e1112726d21eebb51487
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a redirector to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a large number of external PDF links ('PDF_SEO_LINK_FARM') strongly suggest a malicious intent, likely for SEO spam or to lure users to malicious sites. The ML classifier also flagged this PDF with high confidence.

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.me/wix?keyword=c%252F+o+kancharapalem+audio+songs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3d514e_c5c4445eca084dd2ae4275077bbaea76.pdf
    • https://static.usrfiles.com/ugd/63022f_daa577f97c294175a10c6b0d0eee0fe0.pdf
    • https://static.usrfiles.com/ugd/b7082a_24f452a5d23b486885b5a0989e1a35c1.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/wotumafute.pdf
    • https://static.usrfiles.com/ugd/2486b5_a1f1ab81cbd54a71980e25d8082f7480.pdf
    • https://static.usrfiles.com/ugd/ab059d_3ac01b89693f4a7f9db7f583ddf72c04.pdf
    • https://static.usrfiles.com/ugd/defd8a_7e4be7adeef14392ae25b26841400479.pdf
    • https://static.usrfiles.com/ugd/8b9728_bec8fc789b2c49e2ad016ffef16049d0.pdf
    • https://static.usrfiles.com/ugd/3649d2_63d917d7b26648d3be2401543c12266d.pdf
    • https://cdn.shopify.com/s/files/1/0435/6987/3054/files/third_party_app_store_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/british_english_phonetic_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3388/files/wevade.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_off00007ef1.bin
1a93967383f3f68b407e0ff2a9170e69ade8639257bdd813c9fdacfa708aab8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF1 5492 bytes
font_01_sfnt_off00009173.bin
3357c4969ef11ffabe7ef169656033e3d83cef13308e1ac063bf6cd66f016138
pdf-font-stream PDF embedded font (sfnt) at offset 0x9173 15916 bytes