Malicious PDF — malware analysis report

Static analysis result for SHA-256 3961ab65e43b2ac9…

MALICIOUS

PDF

42.7 KB Created: 2020-08-07 00:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5330e2147c06c2f36e0d56ab11d8d00 SHA-1: 98f966a62ef61582884ad9cd04daf9ba4c8d1099 SHA-256: 3961ab65e43b2ac91a68285d9e9cc6593b5bcfeaf2359ef1e9fe535426bb4638
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a deceptive document body and numerous embedded URLs, including a critical finding of a link to known malicious redirector infrastructure. The primary malicious URL is https://ttraff.com/pify?keyword=lightweight+pdf+reader+for+windows+10, which is likely used to redirect the user to further malicious content. The file also exhibits characteristics of a PDF link farm, with many links pointing to benign Shopify domains, likely for SEO manipulation to improve the ranking of the malicious redirector. 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=lightweight+pdf+reader+for+windows+10
    • http://files.torontopilipinosdachurch.org/uploads/1/3/1/6/131606035/tuger-zegunidulukaf.pdf
    • http://vepaji.greaterdetroitoutreach.org/uploads/1/3/1/3/131380485/wasod-mevatifigetuwef-zupibubulu-xuxobe.pdf
    • http://files.thefarmonfishmarket.com/uploads/1/3/1/0/131070178/5106375.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/digonipananikur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuzodatusowajukekef.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/85409862959.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/jzyk_angielski_podstawowe_zwroty.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4165/files/bulleh_shah_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/95197856480.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/afghanistan_economy.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/nosokojava.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/udp_tracker._openbittorrent._com_80_announce.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/17344436658.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/dedalapuzorud.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_off000067d2.bin
d2befebd86eb5fa54e9f25688488b61223c4c3d75f0caad997fe76b20bd641b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D2 5496 bytes
font_01_sfnt_off00007aa0.bin
87485f6535afe59f631b27f09d3ea5b77d6865efd61aecece081d9ce77da663a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA0 10496 bytes

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