Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85007ea8c1407e1…

MALICIOUS

PDF

48.9 KB Created: 2020-08-18 15:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa8c1b048746c91efc351708ac86ba92 SHA-1: 0b802fe32d7f4d5b8a104b9d12b8a4226907326c SHA-256: d85007ea8c1407e1fac92fc29efb558cc01b77947cd88c0094d9e8d1ea0a4a4d
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link pointing to known malicious infrastructure. Additionally, it contains a mass external PDF link farm, with many links leading to Shopify domains. The primary malicious URL identified is https://ttraff.com/pify?keyword=english+comprehension+worksheet+for+grade+6, which is likely used to distribute further malicious content.

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=english+comprehension+worksheet+for+grade+6
    • http://lexikafa.projectahimsa.org.au/uploads/1/3/1/3/131384169/5fd36aa8649.pdf
    • http://files.pleasantbud.com/uploads/1/3/1/4/131454620/namoxirujil_jipereli.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/this_is_amazing_grace_chords_key_of_c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5974/files/77963834442.pdf
    • https://cdn.shopify.com/s/files/1/0447/3038/4537/files/arraylist_time_complexity.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/85454321119.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/auto_accident_report_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/8640/4000/files/99530622864.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/vovid.pdf
    • https://cdn.shopify.com/s/files/1/0431/4693/6482/files/tafodefevixovumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5852/7397/files/felaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/24135034169.pdf
    • https://cdn.shopify.com/s/files/1/0431/2029/6090/files/68131375824.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/43866489022.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007201.bin
d0436b1933dc618f0c1940868e802295bc022dcd5a89dfc0313da24fd55bf09b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7201 5624 bytes
font_01_sfnt_off000084fe.bin
55dcf6335f16b673ff8f168ab9c7eaa071c3a4d4135a4cbde6b9107494c9c2fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FE 10176 bytes
font_02_sfnt_off0000a7de.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DE 4324 bytes

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