Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fac577e041906ec…

MALICIOUS

PDF

46.5 KB Created: 2020-08-10 18:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc239eefe8fb9d29ade18cbe080882a7 SHA-1: 0c1fdf9be6fedf505d7163c8614b1fd9076cd89e SHA-256: 6fac577e041906ec8668b1097c05c3c37be4c7c3f6679be21fd2307defa240e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=bendable+concrete+seminar+pdf'. The document body, though partially corrupted, suggests a lure related to a 'bendable concrete seminar'. The presence of a large number of external PDF links indicates a link farm, likely intended to obscure the malicious redirector or for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious.

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=bendable+concrete+seminar+pdf
    • http://files.triciaatpuremagicvacations.ca/uploads/1/3/1/3/131380308/4354385.pdf
    • http://files.loyolacardiovascularthoracic.com/uploads/1/3/0/7/130776120/3a1e6761f4.pdf
    • http://files.emericservices.com/uploads/1/3/1/4/131407194/9965008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/favubedezemopazejive.pdf
    • https://cdn.shopify.com/s/files/1/0439/4277/2891/files/dokofifugurara.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/documentation_of_clinical_pharmacy_services.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/27738016304.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6062/files/wudazabawojaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/gukumozopamilijilub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexivopagutufaxusezonav.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/rewawobodidifanuvexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/11722114664.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/79854033382.pdf
    • https://cdn.shopify.com/s/files/1/0452/7587/3442/files/catechesi_tradendae_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/73735495190.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/bagigutevajodif.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/1953_ford_golden_jubilee_tractor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1497/9737/files/72128668599.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_off000076c7.bin
5e2c8740798280e0d3c4f316d485e282c1fd82f8368ffc6dcc7c0207aac62fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C7 5492 bytes
font_01_sfnt_off00008951.bin
87d817ab90ee7309856d48f517968f7fcce5d31e7c14b429e3d6f467fad559ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8951 10764 bytes

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