Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e11cfd3851c396d…

MALICIOUS

PDF

112.5 KB Created: 2020-08-12 10:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23e2659c960c26af2c4961b873e9deae SHA-1: 8a51377e02d7f26222f70c364ac9351e8de5823e SHA-256: 2e11cfd3851c396d3dfa8a6cf153f87e3191c033bd8b0aedc83bd7645dfbad15
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=henri+barbusse+the+inferno+pdf'. This URL is likely used to redirect users to a malicious site for phishing or to download further malware. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the URL itself, reinforcing the lure.

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.ru/pify?keyword=henri+barbusse+the+inferno+pdf
    • http://files.lionscb.org/uploads/1/3/0/7/130775080/775293.pdf
    • http://files.atkinsreddevils.org/uploads/1/3/0/7/130738991/mujutokebo.pdf
    • http://files.levinedesignstudio.com/uploads/1/3/0/8/130813701/9acd3a519b8cc1a.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/19104689743.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/joratu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/righteousness_of_god_in_romans.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9030/5443/files/21548162133.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/77348247950.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/instrument_of_accession_of_jammu_kashmir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/physical_science_textbook_grade_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/wto_analytical_index_2020.pdf
    • https://cdn.shopify.com/s/files/1/0450/3309/5326/files/spc_manual_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7861/files/gimipib.pdf
    • https://cdn.shopify.com/s/files/1/0431/3818/7413/files/second_chance_lyrics_shinedown.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.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_off00016908.bin
e1545ab28bca2e54839ffeec78fd18c868a062589622f0979ec76786d2ac5d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16908 5200 bytes
font_01_sfnt_off00017a9e.bin
b09f78dc6c10dcd5c5b2adca455b3bb3eff0633e87dfe42a947469d9b2a2dab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A9E 10292 bytes
font_02_sfnt_off00019de0.bin
66cd902b334fc3a8a450b3b7a42ffe5031cba7a4412f01eb774febfebf38087b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE0 16116 bytes

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