Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db901309fa09354…

MALICIOUS

PDF

66.9 KB Created: 2020-07-28 02:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ea0ba28a5240248913ca45a9b5fde6 SHA-1: 09c5d8f34146b30811ccfff6171bf8a779d207f4 SHA-256: 0db901309fa09354942964f264fc197d1b92aeaa2d9a5e0ee7baaa10876727d8
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to PDF conversion tools. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious links and the SEO link farm technique point towards an attempt to drive traffic to potentially harmful sites.

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.com/pify?keyword=pdf+to+word+converter+apk+for+pc
    • http://files.wfgcompass.com/uploads/1/3/0/7/130775750/simonalovivu_sevexisido.pdf
    • http://files.brendargarcia.com/uploads/1/3/1/1/131164351/sodoxo-kifaleb-vakebikote.pdf
    • http://files.kyle-a-piat.com/uploads/1/3/0/7/130776298/gawudurawesu.pdf
    • http://files.agoodsoakbathandbody.com/uploads/1/3/1/1/131163960/fipudewezes-gawegadukuga-zosopinenikomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/lelib.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/26112307425.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/ziredulizedopuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/23865493825.pdf
    • https://cdn.shopify.com/s/files/1/0433/7722/9982/files/72992503473.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/50631432935.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0464/files/66880875844.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6594/files/14719340807.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/10069122017.pdf
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/wekilomibixejujigapodose.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_off0000c91b.bin
1d35fc994f8d18ea7dd885da47953f32b73e29739f13482790b08dcea48b1f85
pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 4896 bytes
font_01_sfnt_off0000d9dd.bin
07a1d81a30a8ba2c19058989b20212b83843feb0611970e9ab1e5036131186f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 10620 bytes