Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5a73e105a86d95…

MALICIOUS

PDF

49.3 KB Created: 2020-08-20 08:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9259e9434bcbcfafb433cec152058bd4 SHA-1: 777619f01deeb3f69d232a660d0f0dbd3503deb2 SHA-256: 7a5a73e105a86d956257702ccbc8417f6cc25183bdf6a5103416b31248f5938f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appears to be a link farm designed to generate SEO traffic. One prominent link, 'https://ttraff.ru/pify?keyword=addition+practice+sheets+for+1st+grade', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to educational materials and the malicious URL, suggesting a lure to redirect users to malicious infrastructure.

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.ru/pify?keyword=addition+practice+sheets+for+1st+grade
    • http://files.lowfee401k.com/uploads/1/3/1/3/131384301/surezag-kagiguda-tipitapiloluf-xisex.pdf
    • http://likirol.innerathletes.net/uploads/1/3/1/4/131438096/3032159.pdf
    • http://dowov.amandagretschot.com/uploads/1/3/0/7/130739845/5896801.pdf
    • http://files.officezen.net/uploads/1/3/1/3/131378838/63f753d5bbfda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/hard_short_riddles_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3383/files/pufagepax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/fokobobep.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/35569056196.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/18296755612.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1158/files/karunikebaleteweleded.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/old_ncert_ancient_history_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0446/6691/2921/files/microsoft_office_2010_activation_wizard.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9575/files/18363628517.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/72759244973.pdf
    • https://cdn.shopify.com/s/files/1/0440/5503/6054/files/dani_california_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/lasopuferara.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073d2.bin
ecadce89f53a2be87b64615c4356d8dcb9b85b78a80f51f2626dcb9e0c7ba019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D2 5216 bytes
font_01_sfnt_off00008581.bin
b1f7611508c713d4c2484cee7755f924473dc3e21ee572ecad2d536a26669bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8581 10732 bytes
font_02_sfnt_off0000a9da.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9DA 4324 bytes

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