Malicious PDF — malware analysis report

Static analysis result for SHA-256 880b94fcdc0ba240…

MALICIOUS

PDF

44.5 KB Created: 2020-08-08 13:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1663541e5cf50e7dd0406e36c2064e7b SHA-1: c82ea29bfdc02b5f5cf76a9ab886dc52ce5a79a6 SHA-256: 880b94fcdc0ba2403e4cd8a9865de83eb88fc0d56be75f630396ea1decbab339
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, many of which point to Shopify domains but ultimately redirect through a known malicious redirector (ttraff.cc). The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. The primary attack pattern is to lure users into clicking these links, leading them to malicious infrastructure.

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=calcium+nitrate+fertilizer+pdf
    • http://files.artintr.com/uploads/1/3/1/4/131438161/8000679.pdf
    • http://files.ucsdspeechanddebate.org/uploads/1/3/0/7/130775465/jodab.pdf
    • http://moxitatub.leef.org.uk/uploads/1/3/0/8/130874253/nevipedonuvera.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/65847044871.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/guretemotunumal.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/63107896578.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7558/files/advantages_and_disadvantages_of_computer_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/5327303612.pdf
    • https://cdn.shopify.com/s/files/1/0428/7135/7596/files/sadeporuwedasuxapeguf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0886/0065/files/aircraft_engine_design_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/5548/9948/files/74611555095.pdf
    • https://cdn.shopify.com/s/files/1/0429/1418/5372/files/10851110459.pdf
    • https://cdn.shopify.com/s/files/1/0436/8180/8549/files/15590399227.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/h96_max_plus.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/bibimonelufurujif.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_off0000647e.bin
1de030c4d9bf72a1a5e40a62f4fcdb166839706b3cfc94219ee31e3db79071fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647E 4968 bytes
font_01_sfnt_off00007551.bin
635920b1175f76a523813774d0aa282370d1ffdd7084483456cbcd4bb36df08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7551 9852 bytes
font_02_sfnt_off00009708.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9708 4324 bytes

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