Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0039c5441b8072e…

MALICIOUS

PDF

52.2 KB Created: 2020-08-16 22:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f35e2ea3f039e38f6d9eb66213d3c7 SHA-1: ba7254505df5246b985fac6ba592588352e6fec4 SHA-256: c0039c5441b8072eef98d5dde377c1dc64502f55085403ea72a78a595f95dcfe
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains the same suspicious URL, indicating the primary intent is to redirect the user to a malicious site. No scripts were extracted from this sample.

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=what+is+a+conformal+map+projection
    • http://files.learningthroughteaching.com/uploads/1/3/0/9/130968917/448936.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/kaladanoxorivisovelukava.pdf
    • https://cdn.shopify.com/s/files/1/0446/8106/8697/files/pre_algebra_with_pizzazz_answers_page_190.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/kebopufas.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9409/files/jafuxoxakavutowonad.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1829/files/77664358394.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/brampton_transit_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9819/files/zorasexunupavixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/73428276437.pdf
    • https://cdn.shopify.com/s/files/1/0440/1420/7134/files/bikini_body_guide_2._0_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55079075607.pdf
    • https://cdn.shopify.com/s/files/1/0447/8858/0512/files/english_to_assamese_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/tekken_the_motion_picture.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_off000070b7.bin
7576be79b5bd799e08234b897e9e7b267de7b415015f43591dfb958e7e387d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B7 5344 bytes
font_01_sfnt_off000082c1.bin
1ca8861c398964e9f2971c722029842f6b65e74a4c93f0d9c43057964f33e230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C1 13640 bytes
font_02_sfnt_off0000ae7e.bin
b030c5f114b6fb9640e19f6eb85abf2cf37bd3cafc1351ac46ecd309068b4a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 16192 bytes

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