Malicious PDF — malware analysis report

Static analysis result for SHA-256 380f3c7fe1ab9207…

MALICIOUS

PDF

44.0 KB Created: 2020-08-07 13:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1b4d90dc0e76cf28d70cbad985e6551 SHA-1: 773070f66471970643cd2089009094c1999860e8 SHA-256: 380f3c7fe1ab92071a3e38484ed09e347caafc6338c190ddcaae248119ea43d4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the text 'Similarities between verbal and non verbal communication pdf' and the malicious URL, suggesting a lure to a site offering this content. The ML classifier also strongly indicated maliciousness.

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=similarities+between+verbal+and+non+verbal+communication+pdf
    • http://fuwimir.swpay.uk/uploads/1/3/1/6/131637016/vikegukagalofixe.pdf
    • http://xefemukuj.sheriwisemanart.com/uploads/1/3/1/3/131383544/2e8b1.pdf
    • http://files.waveregisteredagent.com/uploads/1/3/1/3/131384173/nonovofesawebax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/wurunulujajogupapuwolemu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/gazedalanelepolop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9674/files/jekewipobej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/vinifepoputo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/jikabobililofona.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/zokukenizosubiket.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/xodoxinunas.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/lugifuzokefupori.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/95778534759.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/22700910174.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0524/files/56564860271.pdf
    • https://cdn.shopify.com/s/files/1/0440/5228/3542/files/fuvipudoni.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/3513589097.pdf
    • https://cdn.shopify.com/s/files/1/0437/6965/9549/files/pink_martini_sympathique.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_off00006cf9.bin
ec01ccf61a1147a2327c6ca66bd8a4ef419d8dc240a0dd7b0664a1ac7b5f1d67
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF9 5696 bytes
font_01_sfnt_off0000805b.bin
68a6ed12ae0d85e3e2fa128899deb49705c57baa0b6caa2527df74798253fec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x805B 10008 bytes