Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e805de7c3e1795…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 03:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fcd48140be3992329c77c50a2bd5fdb SHA-1: 3737409b99318886a33b925996fb4c5dfed0b5d9 SHA-256: f4e805de7c3e1795ce94d0f50237737509389eef8a20a836596a2dfb40dfc7b7
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and heuristics indicating malicious content. It contains a large number of external links, with one specifically identified as a redirector to a malicious URL. The document body, though heavily obfuscated, contains the malicious redirector URL and a benign-looking PDF filename, suggesting a lure to a harmful site.

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.link/wix?keyword=strength+training+anatomy+third+edition
    • https://cdn.shopify.com/s/files/1/0461/9767/0037/files/dil_hai_tumhara_full_movie_with_engl.pdf
    • https://cdn.shopify.com/s/files/1/0437/9577/5650/files/9856578505.pdf
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/apostila_para_aprender_a_desenhar_mang.pdf
    • https://static.usrfiles.com/ugd/c3548c_745e99404f91414abb4fac487dd8bfc2.pdf
    • https://static.usrfiles.com/ugd/cafc24_89513894dde84270bc4156d13bb81c30.pdf
    • https://static.usrfiles.com/ugd/01e791_9c1d0a8ef05c41eaa7c057b4aaeb418d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6cc0c3695a347a68395060aaec38f3e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/ripijusabe.pdf
    • https://cdn.shopify.com/s/files/1/0447/9270/9271/files/3d_max_models_chair_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/0943/9906/files/laser_labels_template_16_per_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2363/8426/files/97977517640.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed34aca71a40419b9ec8ee211011c7d6.pdf
    • https://static.usrfiles.com/ugd/bf650e_877b367b138b488e81e322c9d19a2878.pdf
    • https://static.usrfiles.com/ugd/87fdc7_d284785de2a342988c744f85669f77af.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073cb.bin
44cfd1f0770bfbbee3150e419d0c18b9cd01c222b07a05c2dd97a541ea715623
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CB 5232 bytes
font_01_sfnt_off00008565.bin
3fe443ee6c2a6cb69c8eee15fbb99a95496ca2cc37f5c9ea488ac213c32f4224
pdf-font-stream PDF embedded font (sfnt) at offset 0x8565 10352 bytes