Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc674a6d844f2e1c…

MALICIOUS

PDF

44.0 KB Created: 2020-08-25 19:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c4db21b938b6e0e83e93d0523ae001 SHA-1: a90260d9685ac29d7533f7d6d1bcb50ce23683e0 SHA-256: bc674a6d844f2e1cc92d63733f65f68f5ffee9801697e264f80e7fd7b3691139
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for movie downloads. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which likely leads 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.com/pify?keyword=bridge+to+terabithia+2+return+of+leslie+full+movie+download
    • http://files.lostlove.co/uploads/1/3/0/9/130969971/1825bac09c881da.pdf
    • http://lutoju.tomsolaribuilder.com/uploads/1/3/1/6/131636744/lazujag.pdf
    • http://zupukutad.thebeachhousestyle.com/uploads/1/3/1/4/131454165/desugokabij-zesexumelam-jugezel-fibuzevagusu.pdf
    • http://selalewa.professionalfacilitators.com.au/uploads/1/3/0/8/130874218/402ddb.pdf
    • http://files.thedemureist.com/uploads/1/3/0/7/130739311/fewaxuboruf.pdf
    • https://cdn.shopify.com/s/files/1/0462/7542/8512/files/42395206133.pdf
    • https://cdn.shopify.com/s/files/1/0436/0116/6498/files/buzebopigafusumukoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/54386787898.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/androides_reales_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2338/files/jiduvexinufenipoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/fatovavexusonepeku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8688/files/ballade_no._1_in_g_minor_op._23.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/80330163764.pdf
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/lurofakun.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3762/files/majexezuleliwomizoz.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_off0000545b.bin
26dffcbda06d4c3d22f2a62d8ed05be4cf89b63ea319d77e90409c7c60eed291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x545B 5792 bytes
font_01_sfnt_off000067fe.bin
f03f9d8f9f70585a4ffd3b61904701e5044fb82af6309d2ff1717c35868d7b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FE 10188 bytes
font_02_sfnt_off00008b12.bin
bfa32af85ed9733e9d329932c5444ef017f43cd1cf31216f18da05059aa2c43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B12 16632 bytes

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