Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e6688777d9ee75…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 10:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4567b1be5b0745ca982a9a1e2e92632 SHA-1: 7c053bd72ee60d64e774a1f7f4a125c5819a3515 SHA-256: 81e6688777d9ee75bb0a072e5f59ba3db35b8105390cdba0bfed56f81d06c5a0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=basics+of+electronics+and+instrumentation+engineering+pdf'. This indicates a likely phishing or malware distribution attempt. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains, suggesting an attempt to obscure the malicious destination. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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.cc/pify?keyword=basics+of+electronics+and+instrumentation+engineering+pdf
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdf
    • http://files.nessasnotes.com/uploads/1/3/1/3/131379409/dunafakasor.pdf
    • http://files.habitathawaiiisland.org/uploads/1/3/0/7/130775892/giganikogim_siwozujolupu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/jacksmith_cool_math.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/pelegilime.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/19812967367.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/93336316244.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/71066727482.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/zukara.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5920/files/76194894004.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3426/files/77795408943.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1615/files/a_noite_do_meu_bem_partitura.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mirogorozizodixomalejog.pdf
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/onn_universal_remote_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/wotedanakologazoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/41864713274.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_off00006122.bin
8fb0d418a1e16eb1531dbc1dc839a6145b5c7e7824994122e2aa18a4a482d19c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 5524 bytes
font_01_sfnt_off000073da.bin
c7efccff69b4cfdf7a615be2f0ea87fca04d543dde550573c05857facef9e58b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DA 9852 bytes

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