Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebedd720a88e270…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 16:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e057fa17996fc5c588bc10f8f03536e SHA-1: 4b617d9ca9446e87f74378a315b821a795c064d7 SHA-256: 2ebedd720a88e2701b199c99eb3d6beb30607c8804e8a72204fe33e8b3c411f4
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of embedded URLs, many pointing to Shopify, suggesting a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=free+printable+calendar+august+2019+pdf, which is likely used for redirection or SEO manipulation. The ML classifier strongly supports the malicious verdict.

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=free+printable+calendar+august+2019+pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/77298733492.pdf
    • https://cdn.shopify.com/s/files/1/0436/8410/2297/files/b._v._ramana_higher_engineering_mathematics_mcgraw_hill_education.pdf
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/printable_australian_child_passport_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/77055911813.pdf
    • https://static.usrfiles.com/ugd/f63f29_84bec326e4d9415f9801e5ca51e8955e.pdf
    • https://static.usrfiles.com/ugd/93971e_08b6c2e2c2e647709c624c0bb52e2f9d.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/zadesifufirimegetakiroj.pdf
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/new_birth_missionary_baptist_church.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3525/files/world_cup_2019_match_date_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7927/files/first_break_all_the_rules_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/worshipped_or_worshiped_spelling.pdf
    • https://static.usrfiles.com/ugd/7d21c0_88b324d6cecf44b4afe2a409b3663278.pdf
    • https://static.usrfiles.com/ugd/b8c837_914e50164efb4cff885d8ec87f55bdec.pdf
    • https://static.usrfiles.com/ugd/18122d_ee4f3396d57e47d384c81fc04164a3b3.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_off000061ed.bin
491308b5826b5d1d11995acb285cc5f6eaa0e9963d66ebb509906e18dc7c8c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 5672 bytes
font_01_sfnt_off00007538.bin
fcf8dcdf163c4ec646fc64526612a6cedb03ed03d6b93908c5662191671a16cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7538 9712 bytes
font_02_sfnt_off0000965d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x965D 4324 bytes

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