Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc51a94f03a1188…

MALICIOUS

PDF

41.5 KB Created: 2020-08-09 19:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8afae29c5c69fb78555447f9cc7a446 SHA-1: 3aa484af95c8c1fbba485f7e3840f459ae09a35b SHA-256: bdc51a94f03a11887e318b1ed1a2ddc3648605b0705fc405204ae3b4ea00aa7e
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'document to pdf converter app' and the malicious URL. This suggests a social engineering lure to trick users into visiting a malicious site, likely for further exploitation or credential harvesting. The ML classifier strongly supports the malicious nature of this PDF.

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=document+to+pdf+converter+app
    • http://files.wdmoc.com/uploads/1/3/0/7/130740443/tejovasoxuxo.pdf
    • http://xegusigok.followoncricket.com/uploads/1/3/1/8/131857334/kepezabunaz.pdf
    • http://mirufibe.mennigen-lab.com/uploads/1/3/2/6/132681670/retazusaniw-dajageri-fibodujevuse-lopipizujevun.pdf
    • https://cdn.shopify.com/s/files/1/0440/6460/4310/files/74925394020.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7113/files/socialism_capitalism_and_democracy.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/tovutegedopaladironos.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/47524264549.pdf
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/lalarugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wozofedotomutigetipire.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/gojume.pdf
    • https://cdn.shopify.com/s/files/1/0433/7490/3452/files/putifeloxadubapaxev.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/64508828719.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5478/files/tekovuriwuropajasek.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/certificacion_leed_puntos.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/39383076027.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/cursive_capital_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/74202832201.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_off000062d3.bin
51a93ed18561965be51fa7990e26e4ae023177d7c925f5446b91852c8b2669ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 5152 bytes
font_01_sfnt_off00007456.bin
23712f24ae5ba64f60eba6aebb343e5b6ea038d405f4ad592c0522733721f111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7456 11004 bytes

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