Malicious PDF — malware analysis report

Static analysis result for SHA-256 1142d308d29edd4a…

MALICIOUS

PDF

52.3 KB Created: 2020-07-29 04:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd53e7d22580068f06b57b1c2c04e989 SHA-1: cb9120e70bf9435bce0df318980622348c798ddb SHA-256: 1142d308d29edd4a4a10b04f2003e7fa5d9a32367e6016b7ece5fbbcd75c4f74
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The presence of numerous external PDF links suggests an attempt to obscure the ultimate destination or to engage in SEO abuse for traffic generation. No scripts were extracted, but the primary maliciousness stems from the embedded links.

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=parallelogram+properties+worksheets
    • http://files.partridgehighlands.net/uploads/1/3/0/8/130814682/tamefusuwomeximu.pdf
    • http://files.cookingsavvyblog.com/uploads/1/3/1/3/131381675/8004907.pdf
    • http://files.pierceplayers.org/uploads/1/3/1/8/131856446/800747.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/xanipurixatakorito.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/57279376612.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3980/files/penagiseruru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/73802161675.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/pesig.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/15569690057.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/ziwunilew.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/95320922989.pdf
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/33232688408.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/5629661364.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a53.bin
a70effb01ba092e937508a910d6c0e11cffe1493c1bbfb480e590f726ba76152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A53 5072 bytes
font_01_sfnt_off00008ba0.bin
11353e0c5b9b9e072ac9c50b3598c132b7b2c98d9f49cc6c5a95c5505b67fbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA0 9964 bytes
font_02_sfnt_off0000adda.bin
61cc66c40684a8d20589f33230807071cbab6d5e39727ead1949cbbea0e9c85a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADDA 16284 bytes

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