Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b0a7363838d4b7…

MALICIOUS

PDF

53.7 KB Created: 2020-08-06 23:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f6d324960aa73324039c2755bfb3e4a SHA-1: d52dda2465a1f0226e233a2b1383bdd7badb4615 SHA-256: 48b0a7363838d4b7f26f5fbeaf1c20114ab63b91ba66ca75da31f72a072bacd0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=learning+arabic+words+pdf', reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=learning+arabic+words+pdf
    • http://files.cloudvalleycashmere.com/uploads/1/3/1/4/131406785/9495024.pdf
    • http://files.destinybydesignonline.com/uploads/1/3/1/6/131606046/wujaden-kezerelepuka.pdf
    • http://files.ktkayakrentals.com/uploads/1/3/0/8/130813855/e25a2f28b7.pdf
    • http://files.daphnehocakedesign.com/uploads/1/3/0/7/130739789/wamuzapojupaxeworupo.pdf
    • http://files.tankenterprises.ca/uploads/1/3/0/8/130874595/mukuworulusuki.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/quantitative_chemical_analysis_harris_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5111/files/32630831643.pdf
    • https://cdn.shopify.com/s/files/1/0428/3092/1894/files/aadhar_card_update_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/75476339420.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/23698379828.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9950/files/things_i_wish_i_knew_before_i_got_married.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/normal_cdf_versus.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/basubaninaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/22677416947.pdf
    • https://cdn.shopify.com/s/files/1/0432/8285/8144/files/78631824387.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5263/files/fowunilumelurake.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/85756847581.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/37090482825.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
stream_005_off00009b35.bin
950fed63cf5319a28e9245ef45cac55ded45109d68a452a923e294608e6aee89		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9B35 25864 bytes
font_00_sfnt_off000062aa.bin
a78edd3ec9ca1d900cf0dc09e815fca039a595141a8da3b165abec57216ce6d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AA 5464 bytes
font_01_sfnt_off0000755f.bin
1c81f9c5506262e1346eed51d2927bbfa24091891587cbf7a799fcf3a354b914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755F 12108 bytes

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