Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4dae3ea4e84178…

MALICIOUS

PDF

99.4 KB Created: 2020-08-25 02:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3ab64a8b466b28d0bd03b90dd5522ee SHA-1: 5849332a633eb073f79e00ea4f89185113ff3936 SHA-256: 4a4dae3ea4e841784e726cb08bdae5fb8d693df7931b042bcaf8936203ff06c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, identified as a link farm, pointing to a redirector URL (ttraff.ru). This suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the link farm is a strong indicator of 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.ru/pify?keyword=dry+reforming+of+methane+ppt
    • http://zisafeza.jakyoga.com/uploads/1/3/2/6/132696056/sajaxitar_putibex_mazibogobavufu_fudapasemixa.pdf
    • http://files.wizardmarqueesandevents.co.uk/uploads/1/3/1/0/131070501/6607885.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/child_development_and_pedagogy_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/xavubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/wijusutajitosivutuzamuse.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5798/files/pixixav.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/behavioural_revolution_in_political_science.pdf
    • https://cdn.shopify.com/s/files/1/0430/0845/8905/files/grammar_tenses_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5353/1807/files/84218120910.pdf
    • https://cdn.shopify.com/s/files/1/0434/6796/4580/files/69034056903.pdf
    • https://cdn.shopify.com/s/files/1/0431/6538/4866/files/kamizenojimewinibor.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/format_sd_card_ubuntu_fdisk.pdf
    • https://cdn.shopify.com/s/files/1/0436/4818/8569/files/tasafilafotobadalosinuri.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/tuzutitemarobufoxonin.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_off00013dc4.bin
6a402e6cfa3f5f9e5bcce17d89babd347acaca88352fc58a0db83f27a0fb1f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 4996 bytes
font_01_sfnt_off00014e99.bin
99f9e1f307f1eeddb75a6a53cf7d8f6a31d26808d52514f56d62090d6d91a6f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E99 10376 bytes
font_02_sfnt_off0001721f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1721F 4324 bytes

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