Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa82a374a74ae52f…

MALICIOUS

PDF

57.2 KB Created: 2020-08-22 18:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f78af8baedf031a26c83b9329c13647e SHA-1: be436188dd7eb0dece72ffdd342aece5c9d90b02 SHA-256: aa82a374a74ae52fb936853fda6516aba49532a32379f27054705c9689769393
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=springer+book+latex+template'. Another critical heuristic indicated a PDF link farm, with many links hosted on cdn.shopify.com. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.com/pify?keyword=springer+book+latex+template', suggesting it is a primary lure. The overall pattern indicates a likely phishing or scam campaign leveraging a large number of redirecting links.

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=springer+book+latex+template
    • http://files.hlhas.com/uploads/1/3/1/4/131483550/wuvoxipepuzan.pdf
    • http://files.andthatmeanscomfort.com/uploads/1/3/2/6/132683135/3fc72852e489.pdf
    • http://xivamum.neuralmechanisms.org/uploads/1/3/1/3/131383483/da669cdc7c5.pdf
    • http://sinive.hansch.org/uploads/1/3/1/4/131437079/f2cedea82fdf.pdf
    • http://pudemenob.louise-roberts.net/uploads/1/3/2/8/132814930/wowogebexixezuginufe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/mofarugiku.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3399/files/kisomolemudoruxetukerol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/mata_ji_ke_bhajan_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/zaxodifofuvemivekilodebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/venifola.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/tikowewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2063/1720/files/fudevaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/random_integer_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/xilezolojifasamezipufif.pdf
    • https://cdn.shopify.com/s/files/1/0449/9115/2287/files/70403223909.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_off00009f3c.bin
21f4cd965d05ada7c0e0ebd639f2233dd76b3e6db59c0f73a74a2fa7ea4bf47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F3C 5336 bytes
font_01_sfnt_off0000b155.bin
cb8edec69efcd7c3299aeec46c340427fefe68792445c0ca1194b805f1117789		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB155 11956 bytes

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