Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dc6a94256ab157…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 09:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4aff7e255f478c2c122dc7b2928e42 SHA-1: a27cd7f1743bf8951ddc8bd35151e75c6ab48950 SHA-256: 90dc6a94256ab15716eda04f88e725aab9b549f5f50b5d4688e6b5442eacc422
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=possessive+pronouns+german+pdf', which is flagged as a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users.

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=possessive+pronouns+german+pdf
    • http://sovuj.fastflyingmarketing.org/uploads/1/3/0/8/130874277/laxebozisipor.pdf
    • http://files.discipleschristianfellowship.org/uploads/1/3/2/3/132302987/7c0ca4.pdf
    • http://files.edithbp.com/uploads/1/3/1/4/131482941/xidosofolinigisetot.pdf
    • http://files.wormfoodforthough.net/uploads/1/3/0/9/130969243/e9c22e71c4f8.pdf
    • https://cdn.shopify.com/s/files/1/0454/4213/8262/files/nivazawumebizefagus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/nubifi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1819/7912/files/rutan.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/sefusojezodavalix.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/gumogebojunarowaleruguw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/mhtml_to.pdf
    • https://cdn.shopify.com/s/files/1/0433/7637/8014/files/sonufobowobenefap.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/navanamulunelunibolezej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/32540867328.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/1922186397.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/punctuation_passage_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/4499/3181/files/radelexenuzi.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_off000066bc.bin
46452ad92c05929916242eef77262f06573f8bcc4bf3cb33d9135e7b08a84997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BC 5192 bytes
font_01_sfnt_off0000784e.bin
5aa6a8d2782c0f1beb9f10c37d2b76a03f450e1e8e0819e92fa29d99586d30c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784E 10140 bytes
font_02_sfnt_off00009afc.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFC 4324 bytes

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