Malicious PDF — malware analysis report

Static analysis result for SHA-256 b547fcd10a35055c…

MALICIOUS

PDF

46.2 KB Created: 2020-08-07 01:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c1012b33507a90fe06e67728060320 SHA-1: 80ae6ccd1f9de1a13acfe3bb4fef77c31b9674ee SHA-256: b547fcd10a35055c335311708c2cf33ee2a96ad46afc5029dc554c883f719883
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=architecture+residential+drafting+and+design+12th+edition+pdf, which likely serves as a gateway to further 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.ru/pify?keyword=architecture+residential+drafting+and+design+12th+edition+pdf
    • http://files.kansascarryconcealed.com/uploads/1/3/0/7/130740242/7705061791c5d.pdf
    • http://files.stealthentertainment.net/uploads/1/3/2/6/132695556/587095.pdf
    • http://files.womensquartermarathon.com/uploads/1/3/1/4/131483153/fonapudonijepirake.pdf
    • http://files.anneburkephotography.com/uploads/1/3/2/6/132695258/zajobixixo.pdf
    • http://files.mrainc.com/uploads/1/3/0/7/130775368/4918e5.pdf
    • https://cdn.shopify.com/s/files/1/0437/8266/8437/files/jifuvok.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/26541384621.pdf
    • https://cdn.shopify.com/s/files/1/0435/6125/5073/files/1365020261.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0047/files/nutuvibewipixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9109/files/zatasonofolu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/64837849608.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/zulewedinev.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/gatomod.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/actinomicosis_bovinos.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/power_amplifiers_classification.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_off0000609a.bin
ea6f23999e735d4ab824d9f385165fbc2e19e5bfb60b2e23a7b272df65932f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609A 5592 bytes
font_01_sfnt_off000073a2.bin
e5548976ba479764960b84e42dc37d3382a2124bd2cc2063a62ba8c8bf62d4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A2 10184 bytes
font_02_sfnt_off000096b6.bin
0b6d67ed6f7b9ca340f69bc1efbee2cf1faeb02ae856abbfc241c325d1d7b232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B6 16064 bytes

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