Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b10bec5a3875fc…

MALICIOUS

PDF

56.0 KB Created: 2020-08-13 22:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc2d78eb8d6d7482150cd7f6ed4c83e5 SHA-1: 04d4910100d1fb55a1fa73d0da7733ef10fcda6c SHA-256: b4b10bec5a3875fc056ba99a51385303a5c99c6cad1ce232139c598ac311b929
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'ttraff.cc'. Another critical heuristic indicated a PDF link farm with 30 external links, many hosted on shopify.com. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=consumer+reports+best+convertible+car+seats+2018', suggesting a lure related to consumer reports. The primary attack pattern appears to be the distribution of malicious links via a PDF document, likely for SEO manipulation or to direct users to phishing or malware sites.

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=consumer+reports+best+convertible+car+seats+2018
    • http://rebikeged.irenelopezphd.com/uploads/1/3/2/6/132682883/3411243.pdf
    • http://files.gobeyondracing.store/uploads/1/3/1/3/131380504/fezolowuvodume-dopivajeros-womutizetoturot-vudokevalurakon.pdf
    • http://files.pltma.com/uploads/1/3/0/7/130739601/5168586.pdf
    • http://sidokajar.doodahsoul.com/uploads/1/3/1/4/131437886/1346612.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/remove_commit_from_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/26193367027.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/29276920987.pdf
    • https://cdn.shopify.com/s/files/1/0437/0969/4107/files/causes_of_greenhouse_effect.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/thakur_prasad_calendar_august_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/7355/8935/files/christmas_songs_for_children_s_choir.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/37491926574.pdf
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/temperament_and_character_inventory.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1781/files/ramisopopadadeti.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0813/files/68185824201.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/makupibovositoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/bidukukejojukumovoraso.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_off00009b89.bin
4553240b57f1d0106b472c22fc70eba9c735bbb84f9478c2468be0576e229426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B89 5704 bytes
font_01_sfnt_off0000aece.bin
67c5476e934cb294f6e01a992c836b1fce3ca90ee21a0b326e7e94730fd021dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 10352 bytes

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