Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af2730ea7b4fb18…

MALICIOUS

PDF

51.5 KB Created: 2020-08-19 22:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d913a827c831b5d0d4883a7f7e305543 SHA-1: c7a1fe8b6151da6e92043fb073930e20fe209ecd SHA-256: 3af2730ea7b4fb185024e554f6b01eff9fee9adc331efd5a75191b136beaebb9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body also contains this URL, along with numerous other links to PDFs hosted on Shopify, suggesting a link farm designed for SEO poisoning or traffic redirection. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click the malicious URL under the guise of a software download.

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=emulateur+ds+android+telecharger
    • http://files.bellanaturareggio.org/uploads/1/3/1/3/131382113/jekerugipubogukos.pdf
    • http://guloxibej.mountaincelebrations.co.uk/uploads/1/3/1/3/131378776/ed931235b.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/xekuxojufem.pdf
    • https://cdn.shopify.com/s/files/1/0432/4196/3679/files/novukametuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/26277563582.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/jozarabo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/kotor_naga_sadow_puzzle.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/16777759473.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/koxuxupupewesomigamupofov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/pepesoxelotuzuwevililadad.pdf
    • https://cdn.shopify.com/s/files/1/0454/5006/8126/files/94424153053.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/lovogomedanaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0072/files/20725350151.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
stream_004_off00006bb6.bin
4eb00dd18c02c4e4621b33bf19f122c2a49cc68d4688fdc5d0c4b53d7c422435
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6BB6 14936 bytes
font_00_sfnt_off000059e2.bin
e014f50057b9689563decce684154b8c17b6496da5014b67a2a87036f8b7856d
pdf-font-stream PDF embedded font (sfnt) at offset 0x59E2 5308 bytes
font_02_sfnt_off00009540.bin
0a75b7bc4ebfc5ea361c48f70ad16de788415a1dd8cafa4867d43ef524d3e8ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x9540 13444 bytes