Malicious PDF — malware analysis report

Static analysis result for SHA-256 887ba2617717a168…

MALICIOUS

PDF

43.7 KB Created: 2020-09-08 18:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03246aa47467fc5431a54b36e0e0dc6a SHA-1: 802c6f1c8ad346ce483a0bcc768a080cd6328159 SHA-256: 887ba2617717a1681629dadbb5a7d8884800730b185d190e7e6ed6c66d11feed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of 30 external PDF links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into visiting malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=accident+escalation+incident+investigation+and+reporting+ppt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/jawozobugemibamatelape.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/43009778707.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/10530879778.pdf
    • https://cdn.shopify.com/s/files/1/0437/3708/8154/files/ad_d_dungeon_master_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/american_english_file_1_workbook_descargar.pdf
    • https://static.usrfiles.com/ugd/d2751c_a8f5458b9a7a4dda8f6917b3060fbae1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f42fa93df0546c9ac42e8f7dbf5d4df.pdf
    • https://static.usrfiles.com/ugd/822ecd_7d566954e6ab4b6fa7b40aad487cae47.pdf
    • https://static.usrfiles.com/ugd/957c7b_beabb92019bf4a8f85f93c62d3f9cbd4.pdf
    • https://static.usrfiles.com/ugd/6203b9_2fb3839b841b493fbb1668e79ae7c2ec.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/53645546461.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/sexavubisif.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/kavuwesugelizu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/62127315428.pdf
    • https://cdn.shopify.com/s/files/1/0463/3414/8763/files/guia_autometrica_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0440/4147/0117/files/8144501638.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_off00006c30.bin
3fdcffdb02afeff9ffb6bf71ebb7adc88769a98bc660185fb2c44de94e5628f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C30 5288 bytes
font_01_sfnt_off00007e49.bin
a73e7af97dc17c7ace36548abbaeb42ab16967341ddbb5b4583f9dea2476ed75
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E49 10168 bytes