Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35931e80a0699d8…

MALICIOUS

PDF

40.9 KB Created: 2020-07-10 16:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ddd77b49caa6a923859004cfb22938 SHA-1: adac2626a03111fc05d2762775eee1c23d49baa9 SHA-256: f35931e80a0699d8c255e79349473bd5c8c124af8661da3c24c866c3335c0b17
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier with high confidence. It contains a large number of embedded links, presented as a book, that redirect to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/wb?keyword=the%20little%20red%20book%20of%20selling%20pdf%20free, which is part of a link farm designed to lure users to download further 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.ru/wb?keyword=the%20little%20red%20book%20of%20selling%20pdf%20free
    • http://files.dorabramden.com/uploads/1/3/1/3/131382141/3729828.pdf
    • http://files.westvlietstreet.org/uploads/1/3/1/3/131383748/situxatefesupigemug.pdf
    • http://files.quickrunbag.net/uploads/1/3/1/4/131437531/9bf45beb640e4.pdf
    • http://files.studio20-hairsalon.com/uploads/1/3/1/4/131438692/5260813.pdf
    • http://files.renew-wellness-center.com/uploads/1/3/0/7/130776452/fuzaduxudiv.pdf
    • http://files.themobilityfactory.eu/uploads/1/3/0/8/130873971/1372500.pdf
    • http://files.paramountrec.com/uploads/1/3/0/7/130775827/wanuvawofi.pdf
    • http://files.backtoroyalty.net/uploads/1/3/1/8/131856770/7976015.pdf
    • http://files.bikeshopgillette.com/uploads/1/3/1/6/131606173/6466384.pdf
    • https://tagojuk.files.wordpress.com/2020/07/wexonoziz.pdf
    • https://xupapinir.files.wordpress.com/2020/06/tevedof.pdf
    • https://safizur.files.wordpress.com/2020/06/14492774942.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifizazuxapi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28664871254.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24863128440.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/fikajutavulelegig.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bee.bin
4166c1568241b344729789df1b84f9cb311e9ee3f2cd20016e0f7bd90ad7df34
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEE 5036 bytes
font_01_sfnt_off00006cfb.bin
6f184898b8e860579e2a9ef9014d52c754a7346723d5d3888ed12223110f1f7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 13008 bytes