Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbc69c27db2fb88…

MALICIOUS

PDF

45.2 KB Created: 2020-08-07 15:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edf2443a00b63ec4d3c060eb9544d4c1 SHA-1: 4129843d986f60db74e6e5416d02121800ec9f53 SHA-256: 8cbc69c27db2fb8842beb5d917994abeb08bf437ff2de99876ad278afcade80f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=ap+psychology+pdf+myers', suggesting a lure related to academic content to entice clicks. The presence of a large number of external PDF links, many hosted on 'cdn.shopify.com', indicates a link farm strategy to improve search engine visibility for malicious content. No scripts were extracted from this sample.

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=ap+psychology+pdf+myers
    • http://bomimuj.mactire.ie/uploads/1/3/1/3/131379246/2e3b2dd2b670c.pdf
    • http://files.williamverity.net/uploads/1/3/0/7/130739892/sokokadatanebo.pdf
    • http://files.southdartmoorcommunityenergy.org/uploads/1/3/1/0/131070861/mopokegelugutu.pdf
    • http://files.runtoclimax.org/uploads/1/3/0/7/130740547/donewenexovu_gukabetatidil_tagigesi_rufuxezilu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0432/6119/8500/files/wezemojav.pdf
    • https://cdn.shopify.com/s/files/1/0430/7081/6407/files/bibulixuxuxupozovubemax.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/rugok.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/mcconnell_brue_flynn_macroeconomics_19th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/vojafijuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/wogirepafefulexete.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/vikudufusesosigapoduno.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/pinojid.pdf
    • https://cdn.shopify.com/s/files/1/0433/8214/5182/files/swg_crafting_macro.pdf
    • https://cdn.shopify.com/s/files/1/0437/4783/6065/files/acca_f1_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/bajipirixorafanopama.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073b9.bin
9071fc00d146331ec2e89c2f188ea953ead53e3c9dad8625de86861df6e6bd26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B9 5448 bytes
font_01_sfnt_off0000862d.bin
3b01e9b6c83e8e9467945cdf088580dbec3b40d22c1d7e4ad26a5040f31cefdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862D 9956 bytes

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