Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0b51571da51eb8…

MALICIOUS

PDF

56.8 KB Created: 2020-08-09 10:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8c03bc8b2375a2890487f53fc515128 SHA-1: 3e17e17917e8a2943f00a1c1212bbc7741c76d3e SHA-256: 1a0b51571da51eb8fe814f03f0ba13c27dbe42c8237f15e932d2fc8aae5ebf1f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=captopril+mechanism+of+action+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.cc/pify?keyword=captopril+mechanism+of+action+pdf
    • http://laruzotem.asthewoodturnzne.net/uploads/1/3/2/7/132740978/4de5afc.pdf
    • http://files.lifeinthetumbleweeds.com/uploads/1/3/0/7/130775859/texobogoxemikuj-siwovupi.pdf
    • http://files.eurekabuilding.com/uploads/1/3/2/8/132814241/e63139bdf00562.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/24304106354.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/xuvobakobur.pdf
    • https://cdn.shopify.com/s/files/1/0435/8691/2413/files/cambridge_english_business_benchmark_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0438/0724/4450/files/vebefimajopekatuzituwodu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/97590876508.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/vekijolixinazulu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/19125559751.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3790/files/apple_social_responsibility.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4153/files/thinking_in_java_latest_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1626/files/chemistry_notes_for_class_12_sindh_board_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1798/4410/files/background_of_the_study_definition.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/momun.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/76969841841.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/89785850013.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_off00008774.bin
6037abfad86c290eede80c431c3174a858a7e81a42ef478d1323c5965fa3a610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8774 5300 bytes
font_01_sfnt_off0000994b.bin
73d50c2aeb3d7dcb2c6fecd875c50151764abf10fbccded8830ccb61bb293c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x994B 11468 bytes
font_02_sfnt_off0000c08e.bin
007a374aec5d4d45bbdc67fde3c8c94fc6ccc240ada643b27ad8df5a7c26b0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC08E 16160 bytes

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