Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf07f1e30c70fcd…

MALICIOUS

PDF

43.4 KB Created: 2020-08-08 16:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dac1a5dded65328ff6796ee772e3beb SHA-1: ccbf5e847b95ad785c9ac797f710934b7abf80df SHA-256: 1bf07f1e30c70fcdd1f4b8596c597e5c303b267f30c951f2e9430d736139896a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'Transportadores de cangilones pdf'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to increase visibility of the malicious content. No scripts were extracted, but the primary malicious action is the redirection to the malicious URL.

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=transportadores+de+cangilones+pdf
    • http://files.mddedcelks.org/uploads/1/3/1/3/131383998/7162934.pdf
    • http://files.kdwineimports.com/uploads/1/3/2/6/132680949/5426331.pdf
    • http://files.bradleystokejudo.com/uploads/1/3/1/4/131406714/jipulofo.pdf
    • http://files.brookeorphanage.com/uploads/1/3/0/7/130775563/5883733.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/89940691548.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/91420246400.pdf
    • https://cdn.shopify.com/s/files/1/0430/6177/2442/files/ledobojisaluzuda.pdf
    • https://cdn.shopify.com/s/files/1/0435/6613/7507/files/doger.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/50306758933.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/50270050564.pdf
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/kibubujuvi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/65133463060.pdf
    • https://cdn.shopify.com/s/files/1/0432/5264/6050/files/buku_paket_biologi_sma_kelas_11_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6177/1430/files/imagenes_para_colorear_mandalas.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/81038057822.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_off00006acd.bin
f3872292d52177416a25479fe2638fd1058784c27adcbe892a41f3baff332c6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACD 5272 bytes
font_01_sfnt_off00007ccc.bin
896fd8b0a82e537b90aaa8c9d81798c0b76af606bfd30efa44c49043da87f0a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCC 10496 bytes