Malicious PDF — malware analysis report

Static analysis result for SHA-256 88abe90a298c3999…

MALICIOUS

PDF

47.5 KB Created: 2020-08-27 20:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ce3f0a1fbac4dd55749de083f28cc07 SHA-1: 2f89b61d0090be2b7b59bc11d6d1cf1fd24acb41 SHA-256: 88abe90a298c3999514c5c6c6d33a7feced22d583f7538259a0ba220674c3113
154 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector disguised as instructions for a baby car seat, likely to trick users into clicking. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/pify?keyword=graco+trilogic+baby+car+seat+instructions
    • http://files.suleamath.org/uploads/1/3/1/3/131398487/povanikelen-siwovewezexuj-rikibip.pdf
    • http://files.northmiresouces.org/uploads/1/3/0/8/130874058/vopilu.pdf
    • http://files.cosmicpolymath.com/uploads/1/3/0/8/130874237/647555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/tamunoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/sefinopafujodadozozumi.pdf
    • https://cdn.shopify.com/s/files/1/0441/3915/1512/files/89720088941.pdf
    • https://cdn.shopify.com/s/files/1/0433/3282/9342/files/15510798631.pdf
    • https://cdn.shopify.com/s/files/1/0431/2449/0397/files/bupogowev.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/28992658356.pdf
    • https://cdn.shopify.com/s/files/1/0438/3273/7942/files/sejuzad.pdf
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/woxorilemumujuxufoju.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/7523665803.pdf
    • https://cdn.shopify.com/s/files/1/0461/8960/9109/files/adobe_photoshop_cs6_crack_dll_files_32bit_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2484/0861/files/36781220614.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/18997016589.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4458/files/77639488757.pdf
    • https://cdn.shopify.com/s/files/1/0434/3319/7718/files/89575711069.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_off00005edd.bin
d05512700018dc8acafbc01cece2858272f7e0404936eee709030d68723af639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 5240 bytes
font_01_sfnt_off000070c6.bin
690bce7c1204d7a998d40391398d518dadd2fdd4279c30ea00f01aca381e7db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 13004 bytes
font_02_sfnt_off000099af.bin
64cd88072e2f7abc959b9c15113a77b8c3b8724d7d3e542eeb3467c24c15e164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AF 16072 bytes

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