Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a4adc32e3b5103…

MALICIOUS

PDF

44.5 KB Created: 2020-07-29 03:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbdcd6992c4fa8245b611c3329a0fd91 SHA-1: 4028d0ac798959ac784b86f392f7853398ded1cc SHA-256: 96a4adc32e3b5103be2a67300caec7c76b84218c96c50430d06bae753ca05375
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is used in conjunction with a PDF link farm. This indicates a social engineering attempt to trick users into visiting malicious sites, likely for malware distribution or phishing. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=oxford+medical+dictionary+free++apk
    • http://files.alive-events.com/uploads/1/3/0/7/130775505/9987633.pdf
    • http://files.hughstrawn.net/uploads/1/3/1/4/131406082/tukej.pdf
    • http://files.scholarlabresearch.com/uploads/1/3/0/7/130738553/5952524.pdf
    • http://files.windersonscreations.com/uploads/1/3/0/9/130969151/321034d114517.pdf
    • http://files.windersonscreations.com/uploads/1/3/0/
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/mepabagisawapoxirexeratud.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/23044057437.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70838758317.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7625/files/gukawotagidezovifuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/3843459144.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/66035095451.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/wekowoxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/10030512861.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/30692544019.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/fomubenipoburored.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/49222853208.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_off00007163.bin
c8d385973f4dcbed7b9d4c69efe91a1a344faf960ad7b73901cd8de0436db064
pdf-font-stream PDF embedded font (sfnt) at offset 0x7163 5172 bytes
font_01_sfnt_off000082eb.bin
93830e5062b3e1b682724106ccd51d607a4d11ec95d14d473594a8789c92c2c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x82EB 10016 bytes