Malicious PDF — malware analysis report

Static analysis result for SHA-256 9561e15837d13d28…

MALICIOUS

PDF

43.0 KB Created: 2020-08-05 04:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e56b630455fd8c5d10db8b2e9103ae4a SHA-1: 805d5a797a9e655ca45180e476b40e3a8f062977 SHA-256: 9561e15837d13d28e12ccc2e598034afa189bed53d9b8f55ed51a8a22485b518
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=angle+relationships+with+parallel+lines+pdf. Another critical heuristic identifies this as a PDF SEO link farm, with 30 generated links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the same suspicious URLs, suggesting a lure to external malicious content.

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=angle+relationships+with+parallel+lines+pdf
    • http://files.delphilibrarydigital.com/uploads/1/3/1/4/131483249/niwofiwu.pdf
    • http://files.subcorentals.com/uploads/1/3/0/7/130740110/7864789.pdf
    • http://files.larrysbuffet.com/uploads/1/3/1/4/131408172/87dde4ba1bb5.pdf
    • http://files.downtownfirst.org/uploads/1/3/0/7/130740385/pesovujudagox-medekeruzek.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/unable_to_load_steam._dll_peggle.pdf
    • https://cdn.shopify.com/s/files/1/0438/3873/4496/files/mexunowaromulaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/gijizosazenup.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/32826556047.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7790/files/bizejevaxuruviwejoxonem.pdf
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/81273891692.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/34993137922.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/18865164306.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/xedovesuzibotebafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/bio_data_form_for_job_application_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/mokodeduwifejofeb.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_off0000546c.bin
5704e873dcc98840180a2f4f1ec8bc492553411211828b3a7ef0d180ff9512f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x546C 5384 bytes
font_01_sfnt_off000066cb.bin
6829057820c592e09ab17b22796df1809bc43e232692ea5e7c1a74a47eda625b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CB 10316 bytes
font_02_sfnt_off00008a35.bin
4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A35 16072 bytes

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