Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dbccfe3a2269d58…

MALICIOUS

PDF

64.5 KB Created: 2020-07-22 11:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4ebab57537893b486283f2fee7aedd SHA-1: 7798405a8c2975d2c7cbc9e81361b720b98351b8 SHA-256: 1dbccfe3a2269d58c07e2f775b4c17fe4b329f4ec54dba1dfcf4e31e1e728167
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, suggests a lure related to 'partnership aptitude questions'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=partnership+aptitude+questions+with+solutions+pdf
    • http://files.jackierobidouxphotography.com/uploads/1/3/1/4/131453560/denukezulejisukaxuwa.pdf
    • http://files.skincarebyjacquie.com/uploads/1/3/1/3/131380849/retuzatubor.pdf
    • http://files.tukawaysleddogkennel.com/uploads/1/3/0/7/130739918/rokutunuwozi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/sapat.pdf
    • https://cdn.shopify.com/s/files/1/0434/1615/8359/files/84036309526.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/fedipo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/78575440767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59526866216.pdf
    • https://muwiful.files.wordpress.com/2020/06/21668507483.pdf
    • https://zodazusuwu.files.wordpress.com/2020/07/ranepivorepaja.pdf
    • https://duvisigu.files.wordpress.com/2020/06/wimokiwororanudus.pdf
    • https://xukojiruxe.files.wordpress.com/2020/06/87800723935.pdf
    • https://dipenafuvepe538297139.files.wordpress.com/2020/07/48090699713.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/75031274942.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/85441860257.pdf
    • https://cdn.shopify.com/s/files/1/0429/0949/9558/files/18505188248.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/69279835497.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/21694123294.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87913440599.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/jemikejijozis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/bipupatobek.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/bemowaraxovapi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ab7.bin
9814b856dc996b8b54c450d8fc2c31d795b6169552851bdebfe2cc1090388201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB7 5228 bytes
font_01_sfnt_off0000ac7d.bin
a463c28c1936b17ff2bc229666d1e7cd007241662b6a4d8fdcccc94ea0fff440		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7D 16096 bytes
font_02_sfnt_off0000de38.bin
c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 16088 bytes

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