Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dc76cb2a7a7a2c…

MALICIOUS

PDF

40.9 KB Created: 2020-07-31 10:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b1be77f85bffe05a8da605bdb5522ee SHA-1: cdd5585c6a799e909bf61be3c21168ab69ab8bd3 SHA-256: 77dc76cb2a7a7a2c2405a62746717425d1b79bf81e0edf768305178153ab06f4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious link directs to a redirector, suggesting an attempt to obscure the final destination or distribute traffic. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports the attack pattern.

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=kitaaba+afaan+oromoo+kutaa+11ffaa+pdf
    • http://files.support.famhealth.com/uploads/1/3/1/4/131437740/3357936.pdf
    • http://files.laureltherapy.net/uploads/1/3/0/8/130813646/nozubipuxokekin_bimidatuwaguba_beregogudatuvos.pdf
    • http://files.goodtimesgv.com/uploads/1/3/1/1/131164386/ziwav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/tokusokijumalozox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/54829609915.pdf
    • https://cdn.shopify.com/s/files/1/0437/6539/9713/files/karavigajorisija.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/14545388052.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/popepasowuwunalatalo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7081/5397/files/sidulegisoloxovonopunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6562/2184/files/16332461397.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/269130939.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/47508508976.pdf
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/lujuragerigejaluvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/34220077858.pdf
    • https://cdn.shopify.com/s/files/1/0440/7063/3624/files/48832009045.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_off000059e9.bin
b805db8f27e317974cf3d873e61b78f0646808e7dfcc01e999fb0df059056a4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x59E9 4964 bytes
font_01_sfnt_off00006aa3.bin
1756585a8fdf3a703121ea49cec173984210cb01998816c8a66b9544788a7ca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA3 13544 bytes