Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfd5cccb9b843a3…

MALICIOUS

PDF

33.8 KB Created: 2020-08-16 22:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e5d01137aa1dac86caf0a3a1ebc249 SHA-1: f97b52ef29eb6c77acab180b484e964936ec5bd5 SHA-256: 1bfd5cccb9b843a3f61ef48710d21147303ab68f24121ac91c2a7cdffc93223f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious link, https://ttraff.cc/pify?keyword=atlantic+starr+free+music, is a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for free music, combined with metadata from the wkhtmltopdf tool. This suggests a social engineering attack aiming to drive traffic to malicious sites.

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=atlantic+starr+free+music
    • http://files.thesunflowerkids.org/uploads/1/3/0/9/130969681/gomevivuvife.pdf
    • http://jomigavu.marosmars.com/uploads/1/3/0/7/130775840/tuzulivowa-fazoto-sutalizuk-joxiwim.pdf
    • http://files.cindyjaquier.com/uploads/1/3/2/6/132681501/0743bbdee32e75.pdf
    • http://tobet.joeprosit.com/uploads/1/3/0/7/130775087/938fd5.pdf
    • http://wagoxa.stepasideeyecare.ie/uploads/1/3/2/8/132814930/e49668141c6fde.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/kibusizevo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7511/4910/files/sobozetotegelezazili.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/49035321884.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/lesizalenibitufufugepuwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/rujubumes.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5458/files/zabirevorosifemewujode.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/8532547031.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5464/files/biocentrismo_y_antropocentrismo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/35578245100.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/61081547116.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/galopanosunube.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_off00004a16.bin
7b1d1b392f1d03e62c686240b0284ed0fd08964ced58f91f4901e8f63e4bf072
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A16 5016 bytes
font_01_sfnt_off00005b02.bin
8532b6103c148a3b81fa1cf87cc526b83801e9dea0b19a75d86e37b6f078437d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B02 9204 bytes