Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8826a2a388ae150…

MALICIOUS

PDF

51.2 KB Created: 2020-08-07 00:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c9a15768e134088a60eb5491f953ff8 SHA-1: 2b2cf3e0317a70b20cef680d876de8eeddda20af SHA-256: c8826a2a388ae1505994a4e0a76cb38760611123b795dac65c93e4e86452773a
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.cc/pify?keyword=brachiaria+mutica+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to this malicious site.

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=brachiaria+mutica+pdf
    • http://files.meridianphysio.com/uploads/1/3/1/3/131380094/mugokapozet_kajudijekeb_xavotu_wosojasebe.pdf
    • http://poboge.kmblaw.com/uploads/1/3/2/3/132303338/9208297.pdf
    • http://files.tallahasseemetalroofing.com/uploads/1/3/0/9/130969045/lilijemewunakupite.pdf
    • http://files.treevalleyfencing.co.uk/uploads/1/3/2/6/132695258/5464022.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/89342259206.pdf
    • https://cdn.shopify.com/s/files/1/0437/1005/4554/files/tavekakedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/belatogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/13987732457.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/jipaxasovuziparo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85755015361.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/relaxing_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/zifomojomejebigobemisebux.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/tuhaf_bilimler_akademisi.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_off00007e5a.bin
4e90916f567b2ff90e50adac83ec08a9f6effcb9d0f961ae45384133034c30a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5A 4784 bytes
font_01_sfnt_off00008e94.bin
937f18171215b1386de44bb68bcb48f564e0315df6a38d77f83ee84ee4592c05
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E94 10208 bytes
font_02_sfnt_off0000b18f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xB18F 4324 bytes