Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc35f123c29991b5…

MALICIOUS

PDF

42.8 KB Created: 2020-08-22 02:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 131220afbff5b99d45c39ac6800ff194 SHA-1: 86acfd49d20dabbc236679d3b9798f0df2797b3a SHA-256: bc35f123c29991b52fd372bda4214bb7ba337e3da532c662d4c8d45141e2e0be
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text suggesting it is an 'answer key' to lure users into clicking the malicious link. The PDF_SEO_LINK_FARM heuristic also indicates a large number of external links, many of which are likely part of a link farm designed to improve search engine ranking for malicious content.

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=ncdrc+answer+key+2019+mts
    • http://files.coachscottschemistry.com/uploads/1/3/1/6/131606257/tifuwujujal.pdf
    • http://files.tiffanygilly.com/uploads/1/3/0/8/130874360/ec80f9d.pdf
    • http://dudomuro.waringbank.com/uploads/1/3/1/4/131482976/jujur.pdf
    • http://xalikug.tammingapaton.com/uploads/1/3/1/3/131383648/f8b1b6cf.pdf
    • http://sakix.thestockmansbreakfast.com/uploads/1/3/2/7/132712207/2471109.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/bebogutaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1343/0686/files/pemuxokaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/wiwawisoporojamenalivata.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/bugafetugoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/8243/2160/files/company_profile_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4884/files/sawinifedilakuzigujuwuto.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/alcatel_pop_4_plus_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/98727195068.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/808900304.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/9286007191.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/62787767612.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c50.bin
dc682c539ebe61fb35395cda99b8602c683560b4ad59e14f7db06c29e50aab7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C50 5392 bytes
font_01_sfnt_off00006e9f.bin
9d296e18a8d126b38c79112bb0f680190f3033488c4056a758ec91ac570ab60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9F 9872 bytes
font_02_sfnt_off00009069.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9069 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.