Malicious PDF — malware analysis report

Static analysis result for SHA-256 79becdc97fa35aff…

MALICIOUS

PDF

69.5 KB Created: 2020-07-29 03:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f5e5a5ccd3f1529c19b64b3e41f3695 SHA-1: 6fdbd3d2af146616abbe9bbcba28c24ed065f90f SHA-256: 79becdc97fa35aff1e94bdf203893a9c80d868b102f4ea7b4260c1171320ebbc
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru). While many Shopify links were benign, the presence of the malicious redirector and the sheer volume of links suggest a malicious intent, likely to lure users to malicious sites for phishing or malware delivery. The ML classifier strongly supports this assessment.

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=la+bella+e+la+bestia+2017
    • http://files.beadsbraidsknots.co.uk/uploads/1/3/1/4/131452997/kejemufaxofufi_viwepip_bezogemozekov_kuvoxur.pdf
    • http://files.alittlenautiorderingsite.com/uploads/1/3/0/7/130774993/nemaluwurilo.pdf
    • http://files.nipponcollection.com/uploads/1/3/1/3/131384604/fejavi-kajise.pdf
    • http://files.dwarfhollowfarmstead.com/uploads/1/3/1/4/131453531/lawivebikono.pdf
    • http://files.atlanticblueaquariums.com/uploads/1/3/0/7/130739928/a11119a4f6.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/lilapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/zuwarosewavabu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2802/7304/files/wugezapukaramaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6094/files/79946267150.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2808/files/jijisoxefopuliburepop.pdf
    • https://cdn.shopify.com/s/files/1/0428/4032/6300/files/wixudojedarofapadebug.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/rudelanuduvibelumalezuwof.pdf
    • https://cdn.shopify.com/s/files/1/0430/7789/4293/files/38759769820.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/52293640873.pdf
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/womigidutigosobizepob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/befevavusaxigo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9586/files/33800608436.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/
    • https://cdn.shopify.com/s/files/1/0440/6778/2808/files/jijisoxefopulib

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c637.bin
90a7929c453932df5a7e2f2e84e7a51445be886e65146f81066b225f6a014f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC637 4644 bytes
font_01_sfnt_off0000d609.bin
b3ded3efde6f14f0c8a19aa09ddcfb75db665a5f088b96b6cdb6d67149d800d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 17084 bytes

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