Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b79772fcd29da1…

MALICIOUS

PDF

43.3 KB Created: 2020-08-18 20:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24751af83fca60c2e95125e6d7285660 SHA-1: 09fdd75a4023ab662e70eab821930e0b58c50f0d SHA-256: 53b79772fcd29da111eb4cc29d0554c98781e0e86ab3bac2d08df3c97cb6471f
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to ttraff.ru, which is known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the string '1080p video er url' which likely serves as a lure to entice users to click the embedded links.

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=1080p+video+er+url
    • http://solexu.wildflowermlhoa.com/uploads/1/3/0/9/130969953/9a6eaea53b2.pdf
    • http://pemuloz.deltafireprotection.com/uploads/1/3/0/8/130874049/reroj.pdf
    • http://vaveroxos.morgancountyillinoishistory.com/uploads/1/3/0/7/130775982/fupijoximire.pdf
    • http://files.bowenheritage.org/uploads/1/3/1/4/131407067/latijujuliruwunu.pdf
    • http://files.adelesphotos.com/uploads/1/3/1/3/131384635/2ee14eac49d2c.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/airway_management_aha.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/spain_visa_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/3336/9503/files/aacs_decoding_vlc.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/89155035315.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/50427859732.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/1169250602.pdf
    • https://cdn.shopify.com/s/files/1/0429/5245/8396/files/casel_wheel.pdf
    • https://cdn.shopify.com/s/files/1/0434/1081/7180/files/magokaberuxozutewofofun.pdf
    • https://cdn.shopify.com/s/files/1/0431/4962/3462/files/business_development_manager_position_description.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/likatuxomivajiguva.pdf
    • https://cdn.shopify.com/s/files/1/0434/6173/8662/files/babycakes_cake_pop_maker_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/personal_bible_study_methods.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_off00005f0e.bin
30a5580078acd9c9f0ed3d90a9d544be3fb17cb1f37154e4934164a97acbd281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0E 4616 bytes
font_01_sfnt_off00006ec1.bin
bd51c13eca518eab667633f91713b8ca840287190b04a88e265431c4b6f44ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC1 10432 bytes
font_02_sfnt_off00009238.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9238 4324 bytes

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