Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ca5e2be826ebc3…

MALICIOUS

PDF

53.7 KB Created: 2020-07-22 10:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a26cc128392c1f7bf3669d01138aa04c SHA-1: 4a5be55cd1efeeeb72408bdbe42fc4b2d9aaa182 SHA-256: 17ca5e2be826ebc342763eb45dbaee3cf719308a2e511ee385f799dee30f7e4d
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to lure users to external, potentially malicious, content.

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/wb?keyword=el%20antiimperialismo%20y%20el%20apra%20resumen%20pdf
    • http://files.teachlearnconnectfcs.org/uploads/1/3/1/6/131606673/d7e6c.pdf
    • http://files.truelightchristianschool.org/uploads/1/3/1/4/131437515/2624507.pdf
    • http://files.buildingyoureternity.org/uploads/1/3/1/4/131407106/9793031.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/vusazagufejadixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/44124254843.pdf
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/mafukiruwumubazafeb.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/foxetokedojem.pdf
    • https://jekiwex.files.wordpress.com/2020/06/73572536842.pdf
    • https://raneguwuvaxa199338652.files.wordpress.com/2020/06/misuwirin.pdf
    • https://wovabaximiro.files.wordpress.com/2020/07/tafoxam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5047/5413/files/55737712204.pdf
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/jifubewumipaxopefoxuvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/giteta.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9201/files/wenowajoxipugabudoposude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xaxigeruver.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/fubekeremosuvinalafab.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/jibofopita.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/kodipovukog.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_off00009207.bin
3bbddc9bcaeafa1d9f30d4af782529d5509ce6f1d632aa76911089b70e25ef47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9207 5128 bytes
font_01_sfnt_off0000a35f.bin
1eac6f8d7964d08cf391e30c17b3c847ae509d3fe7843097aee314f34ae3d35e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA35F 11136 bytes

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