Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b0eb1d436d9024…

MALICIOUS

PDF

41.3 KB Created: 2020-08-04 06:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24c53364817e6b7914ee55a14f930c26 SHA-1: a96bdf57be1ad1346fcaaecde91a74a88acb42a7 SHA-256: 99b0eb1d436d902485c2dc341a225b5db053f93d59819a8dd9716eef2a575e6a
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One prominent link, 'https://ttraff.com/pify?keyword=popsicle+stick+birdhouse+plans+pdf', is identified as a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure related to 'popsicle stick birdhouse plans'. The primary attack vector involves tricking the user into clicking the malicious redirector URL, likely leading to further malicious content or exploitation.

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.com/pify?keyword=popsicle+stick+birdhouse+plans+pdf
    • http://files.bluehorizoncvs.com/uploads/1/3/1/4/131407029/pivukogopuzite-gudokidiwufib-ruzamagibi-belapego.pdf
    • http://files.designfea.com/uploads/1/3/1/1/131164295/fa66105.pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/83599819462.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/33335608555.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/73384767023.pdf
    • https://cdn.shopify.com/s/files/1/0431/0348/6103/files/50873577807.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/lajokogedirolitugusi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/65939805176.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3229/files/76409731250.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/somenomorew.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/vijunax.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/morin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/siemens_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5073/files/raresozivegepi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/bodologuzufef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/nikizopukiramikutodipolut.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_off00006257.bin
0ccc8a556b6f1860c2d7da2a06b3490fa6b8b8eea53e9d9939b75191386baf23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6257 5448 bytes
font_01_sfnt_off000074cd.bin
44bff5a2357f85b734123d4d427d5b2b0b82787d28645bf0786d669cc849cfd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 10404 bytes

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