Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e5d5881987ee20…

MALICIOUS

PDF

133.6 KB Created: 2020-08-18 21:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda24e82c81949569d0aa7ebdd17ec83 SHA-1: c84a471f47fadeecfbdb4202ad8e1da5451b4775 SHA-256: f9e5d5881987ee209b0b15f8520ec353a109a43fc855c473bbd18d36b672beaa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a critical redirector link to ttraff.com, which is known malicious infrastructure. Additionally, it features a large farm of 30 external PDF links, many hosted on Shopify, suggesting a link-farming or SEO manipulation tactic. The document body is heavily obfuscated and contains the malicious URL, further supporting the 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.com/pify?keyword=eu4+world+conquest+guide
    • http://files.broadwaypinups.com/uploads/1/3/0/8/130813765/8391871.pdf
    • http://rikaw.thebirdnthebeastsfarmstead.com/uploads/1/3/0/7/130775818/6957f9f1ba40872.pdf
    • http://files.foxsmama.ca/uploads/1/3/1/0/131070674/7689927.pdf
    • http://suxoju.adriangoldberg.com/uploads/1/3/1/3/131398455/53571b231a3c.pdf
    • http://kekale.parashantiyoga.com/uploads/1/3/1/8/131856372/xevutusagubuvaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/werewolves_of_london_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0448/1767/8497/files/non_benzenoid_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0435/8540/5089/files/45804708249.pdf
    • https://cdn.shopify.com/s/files/1/0435/8402/8833/files/certificate_of_acclimation_american_airlines.pdf
    • https://cdn.shopify.com/s/files/1/0428/2905/4118/files/76951509475.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kitona.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/bedumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/nasotubafalilure.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/90429478917.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/ielts_speaking_cue_card_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/xobesowowulibit.pdf
    • https://cdn.shopify.com/s/files/1/0435/1619/9064/files/46817055953.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9288/files/rss_book_bunch_of_thoughts_in_english.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_off0001ccb7.bin
d21dd1e3f24e05e88f255d759db2bb2bf9ceeb9f02cd6d3e373709bd11d1dbb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCB7 5160 bytes
font_01_sfnt_off0001de65.bin
28b2648f75485054a85aa9deac0aca3fe43802f672b3053b3934c97186e13218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE65 13368 bytes

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