Malicious PDF — malware analysis report

Static analysis result for SHA-256 874287b74cfb0631…

MALICIOUS

PDF

40.5 KB Created: 2020-08-22 10:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 641846c3229fcffba23f9fa75837e04a SHA-1: 8b22fcf9ee8693edd01045049a2e54031382ddf3 SHA-256: 874287b74cfb063119b3e7d72ed3e0769b162a881d8b447d839742524f2ffac4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.cc/pify?keyword=employment+news+app+for+android'. The document body, though partially corrupted, suggests a lure related to employment news for Android applications. The presence of a large number of external PDF links, many pointing to Shopify, indicates a potential link farm used for SEO manipulation or distributing further 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/pify?keyword=employment+news+app+for+android
    • http://riwus.deltapsichapter.com/uploads/1/3/0/8/130874284/xobifivakivalum-tubewagerododub-vafoviz.pdf
    • http://files.proteinforlife.com/uploads/1/3/1/8/131872070/kivav_tudimuse_rinuzoragim_davabepoxole.pdf
    • http://tisixukej.masahitotsuboi.com/uploads/1/3/0/7/130738836/5589353.pdf
    • http://vovigog.riverglennkennels.com/uploads/1/3/1/4/131454215/nixezexirazezib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8351/2473/files/phonics_pictures_and_word_cards.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/logibupufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/11521716942.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/demag_ac_350_6.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9612/8153/files/8369153582.pdf
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/tugemusapitona.pdf
    • https://cdn.shopify.com/s/files/1/0436/9278/5818/files/length_of_string_c.pdf
    • https://cdn.shopify.com/s/files/1/0462/1988/6746/files/uc_browser_free_for_macbook_pro.pdf
    • https://cdn.shopify.com/s/files/1/0437/2037/6474/files/lofokaxudikijav.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/pojedixipeguwaliladevop.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_off000060a6.bin
3fa6b657bd5a789c6257755496f9e7e286217331ae01a9c3894681082a60e3ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A6 5340 bytes
font_01_sfnt_off000072ce.bin
03ef91d1cfb91f5020848447be2b02cd6f32d60f76f503580ac321951c97c0a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CE 10012 bytes

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