Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5071670244fc4fe…

MALICIOUS

PDF

49.1 KB Created: 2020-08-13 00:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 361c474a6ae2230ff12370c0f6838244 SHA-1: 3eb3cc993099c07fb480e3878fbb6d96b2cea0a4 SHA-256: b5071670244fc4fe5c58c702358ec925bf8de1e68042598e903b517b7dbb4a31
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary malicious redirector being ttraff.ru. This indicates a link farm strategy, likely for SEO poisoning or to direct users to phishing pages. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous links to potentially malicious infrastructure is the primary indicator of compromise.

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=patofisiologi+anemia+defisiensi+asam+folat+pdf
    • http://files.swflpodsangels.org/uploads/1/3/0/8/130873769/3810135.pdf
    • http://lanetud.myentouragemusic.com/uploads/1/3/1/8/131856935/kutofamomos-lekaxakev-divigetamobuzug-pagiwofutot.pdf
    • http://files.stjohnlandconservancy.org/uploads/1/3/1/1/131164311/jeref.pdf
    • http://files.entertainmentforkidsparties.com/uploads/1/3/1/4/131437987/536d246bc5a.pdf
    • http://files.storecee.com/uploads/1/3/2/6/132682210/jixuso-wadovazaw-jexofuweza.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/5696252468.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/pixogukukinubemefatazatum.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/employment_contract_sample_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/auditoria_forense_alvaro_fonseca.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/35729817716.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1430/files/kaserofegodev.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4343/files/83339694560.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3026/files/56240568820.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/bhagwat_geeta_yatharoop_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9642/4096/files/20077928970.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/vunuwijajubefir.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_off0000673d.bin
e1f6d4381944ce24e4922d7409b996d1f2adfa4983092cb6b0dd7245d0fadf10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673D 5268 bytes
font_01_sfnt_off0000790f.bin
9b24e59897e6460909acfb1894abdc9f892c5bc1e56fa02e2e0451584f1485e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 2356 bytes
font_02_sfnt_off00008337.bin
c62dce5740b15fee22bc999b732a13c001c4db2ed4c1c4113d82ea4932bde58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8337 15884 bytes

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