Malicious PDF — malware analysis report

Static analysis result for SHA-256 2daa8d730607efb8…

MALICIOUS

PDF

55.5 KB Created: 2020-08-19 07:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 231b5d63f8c75eb7d629efce1ca29b3c SHA-1: 3f91e48e9761813ab52fb269dcd35b7b7a95a5c7 SHA-256: 2daa8d730607efb86cd52765d82ba9c1912ec3ee92e69019ffacedaead07631e
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=maths+problem+solver+apk', disguised with text related to a 'maths problem solver apk'. It also features a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO poisoning or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=maths+problem+solver+apk
    • http://files.empirewindsandstrings.com/uploads/1/3/1/3/131379111/joxutesopuxamage.pdf
    • http://files.mtspokaneband.com/uploads/1/3/1/1/131164569/fasijotitif.pdf
    • http://files.amykaissar.com/uploads/1/3/1/3/131379113/5906852.pdf
    • https://cdn.shopify.com/s/files/1/0431/2544/0669/files/black_nobility.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/86745906140.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87913440599.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1967/files/82318361112.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/volomok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7875/4199/files/46388167775.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4951/files/adobe_acrobat_pro_dc_vs_adobe_pack.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/36373172881.pdf
    • https://cdn.shopify.com/s/files/1/0437/9780/7265/files/87750604917.pdf
    • https://cdn.shopify.com/s/files/1/0430/1481/5901/files/pepukorom.pdf
    • https://cdn.shopify.com/s/files/1/0445/6746/2047/files/body_parts_for_grade_1.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056fd.bin
551986b029780b3362861129032a8fb681750c1de6cc4c83f7ff34611f2eb861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56FD 4964 bytes
font_01_sfnt_off000067d8.bin
79323d12a05a51e835a5d2a404f82caf18bb95775d8161991d9f4dca8fcef6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D8 7072 bytes
font_02_sfnt_off00007ae8.bin
ae93ea228e7c6fff1f7a50d9e92662d2049b980b7d7d02f83b6ced8a6a4a5025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE8 15124 bytes
font_03_sfnt_off0000a9cb.bin
3ebe36c4e351a558bbb6b35f1fbf562f56773e02bdf7a085ab42d135c1f0d68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9CB 17016 bytes
font_04_sfnt_off0000c258.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC258 4324 bytes

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