Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac6738926e57150…

MALICIOUS

PDF

42.5 KB Created: 2020-08-02 15:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28c875035075c313421bee3614b08a98 SHA-1: d29be813828519168bc4262f4b685ce5f3e01cdd SHA-256: aac6738926e57150084cc499e75bdba9db5476e23b19254b3de5986cf6ff60eb
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.ru/pify?keyword=four+hour+work+week.+pdf', is identified as a malicious redirector. The document's structure suggests a link farm or SEO poisoning technique designed to drive traffic to malicious infrastructure.

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=four+hour+work+week.+pdf
    • http://files.eastmidlandspaediatrics.co.uk/uploads/1/3/1/3/131398252/nenekenufo.pdf
    • http://files.smuiyp.org/uploads/1/3/1/4/131438046/notijoraxuf.pdf
    • http://files.freshenuphydration.com/uploads/1/3/0/7/130740069/2337081.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/18309989433.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/30016874870.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/wafamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6841/5400/files/mumupefekuse.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0440/4156/8421/files/sokugiluwotosazabujemonej.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5600/files/zifedijevokime.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/xowejetuwujor.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/79953067717.pdf
    • https://cdn.shopify.com/s/files/1/0429/7572/3673/files/2004_jeep_grand_cherokee_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/24788219367.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_off00006906.bin
3194bcc78ae4d6e82ea495e5172600a22d2725adb24d9735d9d99cda1d06d1e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6906 4852 bytes
font_01_sfnt_off0000799c.bin
db7e37c2216bef740e468b55dcb881067537125b677741d9cf3f7b927962cd59
pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 10588 bytes