Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70c219121cccb18…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 14:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20bf6fea6b28b39facf683be409040e SHA-1: ba5a11b26e970c85b4e10376377c0a69d95bb44f SHA-256: c70c219121cccb18bbd07b22dd51f5b74caec8c0b0de4db07ee303276bdae19e
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=centre+songhai+pdf', which is a known malicious redirector. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, potentially leading to 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.cc/pify?keyword=centre+songhai+pdf
    • http://mizul.melissavanepps.com/uploads/1/3/0/8/130813612/romulufubegexotaxufu.pdf
    • http://files.mywholelifeisshirts.com/uploads/1/3/2/6/132696029/6357115.pdf
    • http://vavarezu.raffaelecassina.com/uploads/1/3/1/0/131071164/b5f6c.pdf
    • http://files.polyroidcattery.com/uploads/1/3/0/7/130775830/juxojev.pdf
    • http://vavarezu.raffaelecassina.com/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0434/7707/4086/files/rogifug.pdf
    • https://cdn.shopify.com/s/files/1/0428/7869/7631/files/5000_followers_pro.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/48403108025.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/72624118778.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/the_psychology_of_esports_a_systematic_literature_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12319118289.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/39349468999.pdf
    • https://cdn.shopify.com/s/files/1/0434/2677/5196/files/7176616535.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/1770368305.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/gadavomunijijatuzavifek.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/81643938542.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006594.bin
cdbf7e8d08562fda257e0b7afed9f3ed3ae3727a9c9762d43681211a6c2385fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6594 5176 bytes
font_01_sfnt_off00007725.bin
74568a967c89eb8f0be3401cddd13b13981f13589e01933477b1d27f1f9b8aa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7725 10500 bytes