Malicious PDF — malware analysis report

Static analysis result for SHA-256 58429ec21bdddd9a…

MALICIOUS

PDF

35.5 KB Created: 2020-08-09 01:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb91699d8e77bc4bf99e7f924ebb1c54 SHA-1: 556c1584cbcf24cd4f647dbba6b1c9de61e3c701 SHA-256: 58429ec21bdddd9ae085d77be38587c8f1c4adbe07613907d4fc8f694b940ccc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL points to a redirector service, which is a common technique for phishing or malware delivery. While no scripts were extracted, the presence of numerous external links, including one to a known malicious redirector, strongly suggests a malicious intent to lure the user to a harmful destination.

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=bulthaup+b2+pdf
    • http://files.learningspiritenergy.com/uploads/1/3/1/0/131070146/9635493.pdf
    • http://runav.charisseabellana.com/uploads/1/3/2/7/132740405/8879088.pdf
    • http://files.14thstreetvintage.com/uploads/1/3/0/7/130775876/363aa7ffe5ff766.pdf
    • http://files.makejaxweird.com/uploads/1/3/2/6/132681501/2805230.pdf
    • http://files.messianiclaw.com/uploads/1/3/2/8/132815015/826316.pdf
    • https://cdn.shopify.com/s/files/1/0431/9779/2420/files/kudenesuxotuxese.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/15809674060.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/web_development_company_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/89566458207.pdf
    • https://cdn.shopify.com/s/files/1/0428/9747/3699/files/slw_eagles_twitter.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/58639731372.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2313/files/68734708627.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/38886181445.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sabam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.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_off00004f91.bin
361b0e8ecb9e2a5184fbc41a00c9bec4bac363a832336b4553bc51ef3b30348a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F91 5176 bytes
font_01_sfnt_off0000612c.bin
9db0e0a198df859c5816ecb588a0038fa910a914e765e70ab52813dec37ea442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612C 9400 bytes

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