Malicious PDF — malware analysis report

Static analysis result for SHA-256 f013a10708fc0d65…

MALICIOUS

PDF

45.4 KB Created: 2020-08-22 11:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c69bd12b759773f057c8ea56b032dfc2 SHA-1: 0ef205c8df527678167218377d9dda6ae677f4f6 SHA-256: f013a10708fc0d6508210d3336fc4a4f4a1a3c5ec1619da5b541b6a78dd19261
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the text 'Standard measurement conversion worksheets 5th grade' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious. 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=standard+measurement+conversion+worksheets+5th+grade
    • http://files.mshaileyswebspace.com/uploads/1/3/1/6/131636990/bafinoxediz-wevulivaxepenov.pdf
    • http://files.attentivesafety.com/uploads/1/3/1/4/131408056/lamidilipukatuborasa.pdf
    • http://files.teensanddeath.com/uploads/1/3/1/3/131383541/xemefuzeme-jemenalipaw-depenesuwo.pdf
    • http://files.ehleringer.net/uploads/1/3/2/7/132740685/9a1013444.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/wuruzavojexonadubogifebin.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/40826412195.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/pokemon_trainer_brawl.pdf
    • https://cdn.shopify.com/s/files/1/0428/9780/1375/files/86398306332.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/sativaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/mereluzulokaxop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6561/4234/files/pejelidon.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/nunososipij.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/oxidation_number_worksheet_and_practice_questions.pdf
    • https://cdn.shopify.com/s/files/1/0463/3948/9953/files/41951130544.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/35049178074.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/discord_roleplay_servers.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_off0000709e.bin
11a00eb95e2a9937689add1929e403602dc381d9e60ae997d5a373297001cb56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709E 5764 bytes
font_01_sfnt_off0000841e.bin
d8be8f3c80f06b8c3d4574f3689939ff821914321515b8f5996c65a3bf07775b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841E 10516 bytes

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