Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1446530a7fd03c…

MALICIOUS

PDF

41.5 KB Created: 2020-08-09 11:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9894fc623dba6e4833e109469ca2da9e SHA-1: 2ff3895c0e1135e77d42f4bea4d8518259a88145 SHA-256: 7b1446530a7fd03c451bf0563da33469959ec2219426e6c2302839329e16e1cc
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute malicious content through a link farm.

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.ru/pify?keyword=volumen+corpuscular+medio+valores+pdf
    • http://wevekopif.villagepottersguild.org/uploads/1/3/1/0/131070450/27a6921.pdf
    • http://demej.paigeelizabethcollins.com/uploads/1/3/2/6/132682883/modukenozabo-jawerajeta.pdf
    • http://files.sarahpalmerart.com/uploads/1/3/1/0/131071067/jafikovenerujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/96780312619.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4260/files/fixture_of_asia_cup_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/71955387797.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1957/files/30682498405.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/bebabitop.pdf
    • https://cdn.shopify.com/s/files/1/0434/6403/2422/files/nazopuwanamokopukilaruma.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/71178710365.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/tijobizariz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/zenawuxitevapomozotutuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/maxuwigapugiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/51475125771.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/84241589444.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/29881495279.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_off00005f72.bin
6776d241c009959dd8e2d6c8fdb8a061c3047cc3f054343ab380fb7b4117b974
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F72 5328 bytes
font_01_sfnt_off00007189.bin
9492d71cc04127ef59844350e856efbfe4b033f5428bc21da3643e0147762d6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7189 11612 bytes