Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67091c5a778bb58…

MALICIOUS

PDF

98.2 KB Created: 2020-08-05 11:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1de8f4c065e5ca7dc1cfd4e207f2edbc SHA-1: 70fa4c18af26912bd3b4606dc28c9a67b3c05701 SHA-256: d67091c5a778bb580d3872238fe904b2f48417b751068947e8d365d40ba723f2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=angular+momentum+formula+derivation+pdf'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. 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.com/pify?keyword=angular+momentum+formula+derivation+pdf
    • http://files.michellexiao.net/uploads/1/3/1/6/131607346/xugex-xotosuzunixovir-kuvareduxifo-fufetatarifu.pdf
    • http://files.clintoncemetery.org/uploads/1/3/0/9/130969652/sifotabevike-fewamoxi-wewirinevig.pdf
    • http://files.thebirminghamplastering.co.uk/uploads/1/3/2/3/132303337/xerodawuxanar.pdf
    • http://files.agawegier.com/uploads/1/3/1/4/131483097/wutalesop_giwur_nojatobatujew.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/15606771399.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5736/files/70467145132.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1318/files/types_of_barriers_to_effective_communication.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3587/files/gujapojoromipufamer.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/6762039810.pdf
    • https://cdn.shopify.com/s/files/1/0431/7767/2868/files/45991814586.pdf
    • https://cdn.shopify.com/s/files/1/0431/8111/3506/files/realistic_minecraft_mod.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3011/files/css_align_button_center.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/40409234537.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/15504248917.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32823332632.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/rozetuwimamada.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_off00011e6e.bin
2f4d060aa5330f523c995bda77f0d991e3af345d77ded466965f67f0ea3f586e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 5232 bytes
font_01_sfnt_off00013036.bin
ea2e89f888953e4109b44422d0dfdea92f943684a4ca5fdbbded9d1cd45eb37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 16976 bytes
font_02_sfnt_off000165a1.bin
4492c506d48326c5c27c262950b324d51e5f3d06bdd0779f8192e7b29503db34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165A1 16200 bytes

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