Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff73ed9c610a8c16…

MALICIOUS

PDF

46.6 KB Created: 2020-08-16 21:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27f1b5d5d745ce4a1fb96fa3da123098 SHA-1: 80c2ee24843ffeb4063394f3118d187ade3ae55b SHA-256: ff73ed9c610a8c1674f343110aae980563563d30b821163323ad9a8999022f2f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a "Bitdefender total security apk cracked" download, which is a common lure for software piracy or malware. It also hosts a large number of SEO-optimized PDF links, many of which point to benign content but serve to increase the document's visibility. The primary malicious URL is https://ttraff.ru/pify?keyword=bitdefender+total+security+apk+cracked, which is flagged as a malicious redirector.

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=bitdefender+total+security+apk+cracked
    • http://files.advantageauburn.com/uploads/1/3/1/8/131872017/nexisipusotagik.pdf
    • http://files.asahionline.com/uploads/1/3/0/7/130738765/8874641.pdf
    • http://files.kylecarrollart.com/uploads/1/3/2/7/132741110/8740098.pdf
    • http://rikekipep.trinityclaremont.org/uploads/1/3/1/3/131384403/kukuxuninazapo-jujufo-vabubeserol.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/wow_tbc_shaman_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7149/5574/files/ceh_v10_certified_ethical_hacker_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/fundamentals_of_vibrations_meirovitch.pdf
    • https://cdn.shopify.com/s/files/1/0437/5517/6097/files/bogotazo_libro.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/learn_english_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/darafevuliv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/felojunog.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/45109382814.pdf
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/nefazesaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/jelurebijofixibizakiru.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_off0000635d.bin
d875fe1d7fb00e9a0172fd0e4ccb3f45fe555ebe08d26a778008595cba858dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 5364 bytes
font_01_sfnt_off000075b2.bin
ce9dc3bd742ee526e640f0bcfa6c67f5730ca9401448db19f1fb9c3c253f39e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B2 10032 bytes
font_02_sfnt_off00009842.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9842 16144 bytes

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