Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44d05399825cc7a…

MALICIOUS

PDF

44.6 KB Created: 2020-07-16 05:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9431ef7326584e083f88fc7315391b2 SHA-1: 0eae894b6a2d58dfab35ce91d8a84551f8a1bc43 SHA-256: a44d05399825cc7a936e44ace8e62b9663dc8c26c098dbd6a36ceabd192a6f60
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, designed to redirect users to malicious websites. One critical heuristic specifically flagged a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the extensive use of deceptive links points to a phishing or redirection attack.

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/wb?keyword=interrogative%20pronouns%20worksheet%20grade%204
    • http://files.midwesteop.com/uploads/1/3/2/6/132681391/tawixogigibo_vufet.pdf
    • http://files.pathofselfdiscovery.com/uploads/1/3/0/7/130775959/fitetavozedabiribi.pdf
    • http://files.loveandmercyfdc.com/uploads/1/3/1/8/131857071/tazowirujuvimi.pdf
    • http://files.galtfarmsgenetics.com/uploads/1/3/1/4/131453256/bomepibos.pdf
    • http://files.junqtique.net/uploads/1/3/1/4/131454012/dcda393.pdf
    • http://files.plymouthnoonkiwanis.com/uploads/1/3/1/3/131384145/1547152.pdf
    • http://files.morethansoulfood.net/uploads/1/3/2/3/132302973/timuf.pdf
    • http://files.closeencountersadventures.com/uploads/1/3/0/7/130739891/zuvuvunanakega_lazelugafobemu_kijujadebita_vuwox.pdf
    • http://files.closeencountersadventures.com/
    • https://bujoguzone.files.wordpress.com/2020/07/3965436907.pdf
    • https://duvonufoge.files.wordpress.com/2020/07/jorexudo.pdf
    • https://tilitimex.files.wordpress.com/2020/07/96508674302.pdf
    • https://kebiwan866168097.files.wordpress.com/2020/06/72270497776.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/52549298050.pdf
    • https://cdn.shopify.com/s/files/1/0433/3813/7755/files/volorikuboveg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/89875943142.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9499/files/84143398923.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/jalotadopejolitaw.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_off000069bf.bin
fe0293a352e044dd0efe2afc0cdc11fd2543fd4a943731d9a5bcf1753928dda9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BF 5312 bytes
font_01_sfnt_off00007be0.bin
ea8b4b9957286a97bf53e8697b51a3f8a4275901941f208635762a0a77b88056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE0 12168 bytes

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