Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ca0248aea0ca8e…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 15:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2fa1e15a670626397de7933a29f8f55 SHA-1: 2a178ec127be009b9d0aedd51bc7c7260d24e7bd SHA-256: e1ca0248aea0ca8ed9f04fc3480abf36d63bd9006bccfcd4233dd9b72b104bb1
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to learning English and the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a phishing lure using a link to a malicious redirector.

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=learn+english+filetype+pdf
    • http://files.moravianseminary.org/uploads/1/3/1/4/131453560/7247118.pdf
    • http://files.mustardtheatrecompany.org.uk/uploads/1/3/0/8/130874067/betegovatofa.pdf
    • http://files.strettoyouthchamberorchestra.org/uploads/1/3/1/3/131380263/lixemuteresewiwolufu.pdf
    • http://files.dedhamcampfair.org/uploads/1/3/0/7/130739275/zufidol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/63683990373.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/tozovusodixamat.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/32777787294.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/negipedukilesevefosenudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niroduwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2903/6199/files/40431641060.pdf
    • https://cdn.shopify.com/s/files/1/0435/6128/7839/files/halle_berry_monster_ball_sex_scene.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/12939406795.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/58424043016.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/4233564284.pdf
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/jubaxafos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/9054159911.pdf
    • https://cdn.shopify.com/s/files/1/0435/9025/4749/files/zobenur.pdf
    • https://cdn.shopify.com/s/files/1/0430/5394/0887/files/kuzalejupiwitasefawogete.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_off00006f6a.bin
1971411c42d57531275933c9d984e2e90e0bd4bb6149dc6799f18553fcf376eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 5348 bytes
font_01_sfnt_off000081a4.bin
5fd92465cab6e3f0003981506f8a5f8bfccbb427c02f62427aafe4c0b0cf37e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 10112 bytes

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