Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee49b83e757ce8ec…

MALICIOUS

PDF

51.7 KB Created: 2020-08-22 12:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11a8a90f340eff307fd94e70fa13ce6a SHA-1: 5b9152cd14db937d2f667277eb202429472c998a SHA-256: ee49b83e757ce8ec94da23fbec3ea4ea319e87edfa9f29959c15a786826aac6b
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=minna+no+nihongo+1+answer+book`. Additionally, it contains a large number of external PDF links, many hosted on `cdn.shopify.com`, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=minna+no+nihongo+1+answer+book
    • http://files.juliacernydmd.com/uploads/1/3/2/6/132695491/luxex.pdf
    • http://basame.priscilladisla.com/uploads/1/3/1/4/131453674/225427f62.pdf
    • http://files.purelivingwithlisamorton.com/uploads/1/3/1/4/131406386/kitulit-sipubab-pesumurug.pdf
    • http://files.biggulpcastnets.com/uploads/1/3/1/4/131407625/8192479.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5516/files/1912620353.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/nefilepijijisidofepunefo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/tixilufin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1558/files/al_ittihad.pdf
    • https://cdn.shopify.com/s/files/1/0430/0754/1401/files/faithful_1._8_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/55974127181.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/2201283967.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/further_mathematics_for_economic_analysis_sydsaeter.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/valor_citroen_c3_2005_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/bioethics_topics.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006413.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 6744 bytes
font_01_sfnt_off000074c7.bin
d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C7 2960 bytes
font_02_sfnt_off00007f49.bin
22996a57c842b7a237d8ee179bb321068f2fde7b7ad72b4705f9bd5c92512f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F49 4976 bytes
font_03_sfnt_off0000903c.bin
37eeed3d06176a098ef3ca160dc23e926be403fd05099e0c154b72f8b2ecbf66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903C 10108 bytes
font_04_sfnt_off0000b2df.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 4324 bytes

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