Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62f0bc9a2a7c973…

MALICIOUS

PDF

66.8 KB Created: 2020-08-12 23:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c1c602532698a74b16c1040c913e03 SHA-1: 348d6c322f7d49dd6e14890a6d2523b6ef7a14f8 SHA-256: a62f0bc9a2a7c973dfa73fa158690857ab6f0e031fff0a3ceb819bf3a216ebca
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=best+way+to+speak+english+fluently+pdf. While the document body contains text related to speaking English fluently, the overall structure and numerous external links suggest a non-benign purpose, likely SEO manipulation or traffic redirection.

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=best+way+to+speak+english+fluently+pdf
    • http://ripemuxap.andrewjohnsart.com/uploads/1/3/0/7/130738696/7192731.pdf
    • http://files.kevanwilles.com/uploads/1/3/1/0/131070080/45b89.pdf
    • http://sikof.yellowstonewritingproject.com/uploads/1/3/1/3/131381078/naduxo.pdf
    • http://files.bunnyandbearphotography.com/uploads/1/3/1/4/131410370/dc81c7.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/65836993826.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/78302714335.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/lowamibijixasavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6399/1717/files/potus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/ash_like_snow.pdf
    • http://files.newhorizons.eu.com/uploads/1/3/0/7/130775342/rixenim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1274/files/techos_verdes_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/2125271885.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/jurnal_bronkitis_akut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golalebilafofuzugetuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/mumafofofowar.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/fao_56_evapotranspiration.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/vowoxibedofox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5897/0280/files/17622853457.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_off0000c7a5.bin
1b501a15b70c26c17a8ba4fa2d81927695c4441eb35c4a508156ad6deb9b4218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 5512 bytes
font_01_sfnt_off0000da88.bin
76d2cf682962567e19474bb32991ab6ff443312179586c31cde23039465a77c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10352 bytes

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