Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79711386a5d0947…

MALICIOUS

PDF

46.1 KB Created: 2020-08-02 08:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 089067a4e984583310924f03389d9e73 SHA-1: 401b531eb0d7598bdd04c082c7e95d286b1fac26 SHA-256: c79711386a5d0947d79dd2068b5fe37144f0d1461f395078a1c95f3105561bc0
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to 'https://ttraff.ru/pify?keyword=javascript+remove+from+array'. This indicates a link farm or phishing attempt designed to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URLs are sufficient to determine the malicious intent.

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=javascript+remove+from+array
    • http://files.branfordhistory.com/uploads/1/3/0/7/130775021/tazamoni.pdf
    • http://files.mrjohnweez.com/uploads/1/3/1/0/131070786/b4eb55d36abfc.pdf
    • http://files.walthamchangemaker.org/uploads/1/3/1/4/131408371/lulaxopafemis_beratalaterevu.pdf
    • http://files.dns-for-me.org/uploads/1/3/2/6/132695351/nuwinidem.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/pivumukozidube.pdf
    • https://cdn.shopify.com/s/files/1/0437/4469/0337/files/givug.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/50652146842.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/22125436990.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/36287767343.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/95849570782.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/zadavagutikinu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/10121107590.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/rafazegedobuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/4279/8757/files/lil_wayne_mirror_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufanagapaxo.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_off0000673b.bin
8fff762e36ca3fa31dbecb05b7d42b7e6687f50cb40494ded55d0f74da4303fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x673B 5280 bytes
font_01_sfnt_off0000792e.bin
babc9d32f1b0153dfd56c6dae0bd7df8cd64383b949d23779f607d351157bd50
pdf-font-stream PDF embedded font (sfnt) at offset 0x792E 2524 bytes
font_02_sfnt_off00008421.bin
ef149606cad2545ac9b08ae7f1a3488513d000b60baba76199403b946ca05f06
pdf-font-stream PDF embedded font (sfnt) at offset 0x8421 12264 bytes