Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0223238ba927dbd…

MALICIOUS

PDF

40.8 KB Created: 2020-09-02 17:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4afc040e69d90b77ed6139b2aff2d27 SHA-1: 65cc06ab770254456541c4fb151c92eba1bdb7d3 SHA-256: b0223238ba927dbd274e5de9c4a941a7681932f7660f3595a76b870443891d8a
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as quiz answers, which is a common social engineering tactic to lure users to malicious sites. The ML classifier strongly indicates maliciousness. The document body and embedded links confirm the presence of a link to a known malicious redirector.

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.me/wix?keyword=fairy+tales+and+nursery+rhymes+quiz+answers
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/apc_smart_ups_2200_tower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0445/3584/0932/files/tactics_for_listening_developing.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/kidedezobazapatoxovoju.pdf
    • https://cdn.shopify.com/s/files/1/0435/7164/2527/files/history_of_arakan_kingdom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/bhojpuri_chhath_puja_dj_song.pdf
    • https://cdn.shopify.com/s/files/1/0438/0547/4978/files/wapejogub.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/xasit.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/39848382361.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/18319068221.pdf
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/scott_joplin_piano.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/50903865805.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/rijolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2557/1733/files/elements_of_style_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4650/files/pedebipakipajiguropi.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_off000060e2.bin
e11107aacb995a6d466dd3a203b75aa688de5d26351c5feeb026ae35fbf7354f
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 5388 bytes
font_01_sfnt_off00007325.bin
e9360b6468b86639cff1fb7400afdd5cb6d8940b92fbc4e17006a7b399ed9b4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7325 10276 bytes