Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbacabbebfd2358…

MALICIOUS

PDF

56.5 KB Created: 2020-08-12 17:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91c3082cb73534c6da7ec049441516a SHA-1: d68f4dda19a6ad7aefde6218e8f4c4506d5f1953 SHA-256: ecbacabbebfd2358b1088d32857a7171c8e430d33bb0a86860555cd14355dbd4
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external links, indicating a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=accounting+dictionary+english+to+tamil+pdf, which is likely used to funnel users to further malicious content. 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.ru/pify?keyword=accounting+dictionary+english+to+tamil+pdf
    • http://files.hkcofc.com/uploads/1/3/2/6/132683111/lobojevaresale_jojolurirukekof_nunaduwarutare_rulilik.pdf
    • http://pututo.collegeofdentalsurgeonsbritishcolumbia.com/uploads/1/3/2/7/132740435/e7966102.pdf
    • http://melane.falsefloorcreative.com/uploads/1/3/2/8/132814930/puzuwesi.pdf
    • http://files.puffpuffpasssmoke.com/uploads/1/3/1/0/131069893/02e4edf848ebd5.pdf
    • https://cdn.shopify.com/s/files/1/0428/2669/4822/files/wuxixoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2614/files/75416653537.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/rowifizalazusavegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/fimemetu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1262/0447/files/nijesuno.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/38029336528.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/call_center_agent_conversation_script.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/gta_5_the_mission_has_been_disrupted.pdf
    • https://cdn.shopify.com/s/files/1/0432/2829/9428/files/17695232952.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/53284297508.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/gozuzisate.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000695a.bin
7dfcba0280ce9ee0953fc1632d1b99989a37810af7febfa1615c90c8a9019fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695A 5540 bytes
font_01_sfnt_off00007c01.bin
3636db43dcfa9b10fbf0a16b86f8ff2ec1a6a7a06599c65f07b9cebc1786f775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C01 16368 bytes
font_02_sfnt_off0000a294.bin
c9fff2c09bc20932402c08c557194890f99f34dba894fbf1509729ffdc774b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA294 10520 bytes
font_03_sfnt_off0000c605.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 4324 bytes

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